Document cannot be reversed in ledger & using this method

What causes this issue?

This process uses reference-based reversals. This method cannot be used
to reverse this document because ledger &V1& is assigned to pooled table
&V2&.
This feature is not supported due to the poor performance of pooled
tables. For more information, see SAP Note 1014076.

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?

First, you should check whether ledger &V1& is indeed required.
You can avoid this error message by either converting the pooled table
into a transparent table (see SAP Note 1014076), or blocking direct
posting of ledger &V1& (transaction GCL2).

Error message extract from SAP system. Copyright SAP SE.