Back-posting only w. same price control (cur. mnth &, prv. mnth &)

What causes this issue?

You are posting a goods movement for the previous period. The system
has discovered that different <GL:price_control>valuation price control
indicators</> have been maintained for the previous period (&V2&) and
the current period (&V1&).

System Response

The above situation is not allowed and the posting will be rejected.

How to fix this error?

There are two possible solutions:
the valuation price control in the material master record must be made
the same for both periods,
or
you must post to the current period instead of to the previous period.

Error message extract from SAP system. Copyright SAP SE.