&3: Period indicator &1 must not be used together with MRP type &2

What causes this issue?

You have changed the period indicator. The combination of period
indicator &v1& together with MRP type &v2& in MRP area &v3& must not be
used since for MRP type &v2& functionality 'Material Doc.' is switched
on. This setting is not supported.

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?

Change the settings. Otherwise the determination of consumption values
would not be correct.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.