07. Integrate documents and inventory safely

An error in master data is unpleasant. With receipts and inventory, the same error can move money, goods and evidence at the same time.

The interface as a product

Document header and items form a unit; Warehouse transfer and transfer positions as well. Clear external process ID, sequence, quantity/unit check and an exact-once closure are central.

This makes the connection robust

1. Define transaction type, external ID, partner, currency, date and status boundary.
2. Create or find the document header idempotent.
3. Transfer positions with robust position keys, unit, quantity, price and control logic.
4. Validate totals and availability before a released business action follows.
5. Manage inventory transfers and positions as a cohesive process.
6. Save X-ERP ID, result and technical completion time.

Prove production readiness

• Head, positions and totals match.
• Double event does not create a second receipt or inventory effect.
• Partial error remains visible and can be continued.
• posting/stock status is only created via a released action.

Mistakes that only become expensive during operation

• Retry after timeout creates second job.
• Positions are written, but head status incorrectly signals completeness.
• The inventory number is corrected directly instead of triggering a movement.

This is what you take with you

Business transactions cross the system boundary exactly once, completely and with a traceable effect.

Further information / source

Related topics

1. For integration specialists – connect APIs and external systems › 06. Synchronize items and partners
2. For integration specialists – connecting APIs and external systems › 08. Writing, idempotence and parallelism
3. For integration specialists – connecting APIs and external systems › 09. Error diagnosis, logging and restart

Frequently asked questions