SYST: Rule & not allowed for period determination.

What causes this issue?

The period method of phase &V2& in depreciation key &V3& has period
control &V1&, which is not allowed.

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?

Correct the depreciation key or create the period control.

Error message extract from SAP system. Copyright SAP SE.