Which ERP covers contracts, tickets, time and invoices for an IT service provider or MSP?

An IT service provider sells recurring services and hours. It needs maintenance contracts, a ticket system, time booking, hour allowances and, at the end of the month, an invoice with a service report, plus quotes, CRM and accounting.

The industry tool for this is called PSA (Professional Services Automation): tickets, time and billing in one tool. Remote monitoring (RMM) often runs as a separate tool alongside. In rollouts at IT service providers, we see that time is gathered customer by customer at the start of the month before invoices are created. weclapp runs this chain in one system, with the gaps the matrix shows.

The Helpdesk and Contract Management add-ons are only available with ERP Services or ERP Trade; ERP Starter is ruled out. All prices are net.

This process is wals.pro's own practice from rollouts at IT service providers, not weclapp documentation:

1. Create a quote.
2. From it, a contract with only the recurring items is created and, for time-and-materials customers, a project order. You set the billing mode on the item.
3. Mail-to-ticket identifies the customer by the sender address (not unambiguous for freemail or when several companies share a domain). For time-and-materials customers, a webhook flow (n8n or Power Automate) links the ticket to the project order; customers with an hour allowance stay without a project order. How many requests the flow may send is covered under Does the weclapp API have a rate limit?.
4. All time is booked, billable or at €0. Travel time is its own item.
5. Customers with an hour allowance get it as a product; the contract creates a sales order with the allowance item each month. They book against the allowance, while time-and-materials customers book against tasks of their project order. How to bill extra hours is covered in How do I bill maintenance contracts, licenses and managed services on a recurring basis?
6. The contract bills at the start of the month; the hours of time-and-materials customers follow at the end of the month via their project order.
7. Every period comes with a service report. For fixed-price customers, we create a service report so the effort stays visible. Whether a €0 document is also useful, you clarify with your tax advisor. This is not a substitute for tax advice.
8. wals.pro AI 4 weclapp helps with quotes, contract changes and tickets, always with preview and approval.

In the first billing month, we reconcile the project order and ticket time before the contract run bills automatically. Invoices from your own billing system: Subscription invoices via API.

A fictional IT service provider has 15 employees with weclapp access, nine of them in the office, and 60 maintenance contracts. At the start of the month, the contract run bills their recurring items. Customers with an hour allowance book against the allowance, time-and-materials customers against tasks of their project order. At the end of the month, a fixed routine decides which hours are billed. The example is made up and shows the sequence, not time savings.

As of 11.10.2026. “Gap” means: not found by us.

Whether an expiry of hour allowances is legally effective is something you check with your legal counsel; this page is no substitute for that.

Disclosure: wals.pro is a weclapp partner. The calculation scheme uses the public price list, not negotiated terms. Monthly costs in euros, net, weclapp list price, as of October 2026, not a quote.

Assumptions of the calculation scheme:

• All employees have weclapp access on ERP Services.
• The add-ons cost €55 per person per month; they are calculated for the people who work with them (technicians: Helpdesk, office: Contract Management).
• No volume discount: for more than ten licenses, weclapp creates an individual quote; whether add-ons count toward that, we leave open. The calculation scheme uses list prices throughout.
• Without rollout, a monitoring tool and an automation tool for the flow in step 3.

weclapp covers ERP, accounting, CRM, helpdesk and contracts in one system; monitoring remains a separate tool. Put your current tool costs next to the calculation scheme. We don't state any savings.

Many vendors bill AI separately, for example by credits, action, resolution, agent or call; the models keep evolving. The page Per document or per user explains the models. For wals.pro AI, this applies: free entry tier permanently, no credits, all features free until 31.12.2026, after that paid tiers by scope.

Quotes are created as a preview and set up after your approval. The AI reads and analyzes contracts; changes to items, prices, periods or billing mode each go through preview and approval. For tickets, it reads instantly; creating, setting status, commenting and booking time run with preview and approval. It books time to exactly one target (ticket, sales order or task), against an hour allowance on request; only for a sales order, that order must be confirmed.

The AI never writes unasked: preview, approval, log. Each approval applies to exactly one change (payload-bound one-time approval via SHA-256). It works with the permissions of the weclapp user whose API key you store. In your own helpdesk, an AI agent drafts the reply and books the time; a human approves. The page wals.pro AI 4 weclapp describes the technology and the full feature set.

Figures checked on 12.10.2026. All prices net per month. The invoices are calculation examples under the stated assumptions and not a quote; the IT service provider with 15 employees is made up.

• weclapp, prices (packages, add-ons, single licenses, feature table, Enterprise): https://www.weclapp.com/de/preise/ → prices and packages, add-on price €55 per month, feature scope incl. resource utilization, Trade versus Services, invoice
• weclapp, contract billing: https://doc.weclapp.com/documentation/vertraege/1-vertraege/1-2-vertraege-abrechnen/ and https://doc.weclapp.com/knowledgebase/abrechnungseinstellungen-bei-vertraegen (weclapp documentation) → run from 3 a.m., billing type; collective billing: https://doc.weclapp.com/documentation/vertraege/1-vertraege/1-5-sammelabrechnung-funktioniert-nicht/
• weclapp, Contract Management: https://www.weclapp.com/de/vertragsmanagement/ → templates, renewal, reminder; contract items: https://doc.weclapp.com/documentation/vertraege/1-vertraege/1-6-vertragspositionen/ → bulk editing, field scope unchecked
• weclapp, Helpdesk: https://www.weclapp.com/de/helpdesk/ and https://www.weclapp.com/de/ticketsystem/ → features, customer recognition, app
• weclapp, ticket billing and hour allowances: https://doc.weclapp.com/knowledgebase/wie-funktioniert-die-ticketabrechnung/ , https://doc.weclapp.com/knowledgebase/wie-kann-ein-kontingent-angelegt-werden/ , https://doc.weclapp.com/knowledgebase/wie-verwende-ich-das-dienstleistungskontingent/ → time on the ticket, billing, hour allowances
• weclapp, SLA: https://doc.weclapp.com/knowledgebase/kann-eine-individuelle-sla-aus-dem-vertrag-ins-ticket-uebertragen-werden/ → SLA from contract, escalation per target
• weclapp, ITscope: https://doc.weclapp.com/knowledgebase/was-ist-itscope-wie-binde-ich-itscope-mit-weclapp-an/ (date of the doc page: 2023) → distributors for hardware
• Own search run in weclapp documentation and product pages on 11.10.2026 → not found by us: indexing, RMM, device inventory, Partner Center, dispatch planning for technicians
• wals.pro's own practice from rollouts at IT service providers, without customer names: process, monthly reset, own helpdesk. wals.pro AI 4 weclapp product documentation, checked on 11.10.2026: capabilities and approval
• AI billing: public price pages of vendors from ERP, CRM, helpdesk, PSA and ITSM, as of 11.10.2026, without names
• Reviews: public Google reviews of BQM GmbH and M IT-Systemhaus, verbatim (BQM additionally on OMR)
• Calculation of the add-ons per person: wals.pro partner knowledge, confirmed on 12.10.2026
• The next review is on 10.01.2027