Report. point with type &3 cannot be assigned at the beginning of &1 &2

What causes this issue?

A reporting point with the type
<LS>Post Goods Movement and Production Activities</> is assigned to the
beginning of a line object.

System Response

For reporting points with this type, the matrix components that are
assigned to the resource are already withdraw
at the backflush for this reporting point and not at the end
of the line of line activity.
Therefore, the components can be withdrawn too early causing incorrect
WIP to be reported

How to fix this error?

Delete the assignment of the reporting point to the beginning of the
line object.

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.