Receiver ledger & stores ledger currency &, but sender & stores &

What causes this issue?

The ledger currency is stored in the sender and receiver ledger, but
has different units in these ledgers, so that a rollup would give
inconsistent data for the field group.

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?

If you want to store the ledger currency, check whether you are using
the correct unit in the receiver ledger.
Otherwise, you should set the field group for the receiver ledger to
inactive in Customizing.

Error message extract from SAP system. Copyright SAP SE.