Fund type of the document in line item & does not match the fund

What causes this issue?

The funding type of the document (cost sharing or sponsor) does not
match the type of the fund (internal or external).

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?

The fund in the line item should be of type "Internal" for cost sharing
documents and of type "External" for sponsor documents.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.