Sending and receiving group combination is invalid for this movement type

What causes this issue?

The combination of sending and receiving group you entered for this
movement is invalid based on grouping configuration.

System Response

The material document cannot be posted.

How to fix this error?

If the transfer was intended to move project stock from one grouping WBS
element to another WBS and is not part of the stock transfer process
configuration, then use a movement type that is categorized as
<ZK>Transfer Posting Between Grouping Elements</> in the Customizing
activity
<DS:SIMG.M_TPMMO_MVT_TYPE>Define Movement Types</>. If otherwise, check
and correct the entries in your
<DS:TRAN.GRM4>grouping strategy</>.

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.