Fiscal year variant & has &, & however & periods per fiscal year

What causes this issue?

The number of posting periods per fiscal year is different for the
receiver and the sender. Only the posting periods should be
summarized.

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?

&NOTE&
The system checks precisely to see whether exactly one receiver period
can be determined from each sender period when the execution period is
entered at execution.

Error message extract from SAP system. Copyright SAP SE.