Only postprocessing records with positive quantities are allowed

What causes this issue?

You want to enter a negative quantity for a postprocessing record.

System Response

This corresponds to a goods receipt with a corresponding positive
quantity. However, postprocessing records are only allowed for goods
issues.

How to fix this error?

Enter a positive quantity.

Procedure for System Administrators

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.