Settlement cannot be repeated - settlement documents already archived

What causes this issue?

The sender has distribution rules with settlement type PER which have
already been used for a settlement in the settlement period. As the
settlement documents for the settlement period have already been
archived, you cannot repeat the settlement.

How to fix this error?

Check whether the costs can be allocated using a transfers or whether
the settlement can be carried out in a later period.

Error message extract from SAP system. Copyright SAP SE.