No document type found in function & for FI-SL posting.

What causes this issue?

The project/equity group suspense program tries to create a FI-SL
posting based on the posting rules for function &V1&. The FI-SL
document type in this posting rule is not maintained.

System Response

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

How to fix this error?

<DS:TRAN.GJ49>Maintain</> the posting rule.

Error message extract from SAP system. Copyright SAP SE.