Field & is mandatory in account &

What causes this issue?

On the basis of this movement, a posting line is generated in respect
of G/L account &V2&. However, for this G/L account, an entry in field
"&V1&" is mandatory.

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?

Enter the necessary data in field "&V1&".

Error message extract from SAP system. Copyright SAP SE.