Field & suppressed in account &

What causes this issue?

On the basis of the movement, a posting line relating to G/L account
&V2& is generated. However there is no provision for an entry in field
"&V1&" for this account.

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 the message is a warning message ("W"), press ENTER to continue
processing. Your input in field "&V1&" will not be taken into account
when the posting line is generated.
If the message is an error message ("E"), you must cancel your input in
order to be able to continue processing.

Error message extract from SAP system. Copyright SAP SE.