Grouping not allowed (see long text)

What causes this issue?

You want to group together parked Financial Accounting documents under
a request number. For the FI document with the document number &V3&
(company code &V4&) the request number &V1& is different from the
number &V2&.

System Response

Documents with a different request number cannot be contained in a
bundle.

How to fix this error?

Check the grouping you have chosen.

Error message extract from SAP system. Copyright SAP SE.