User exit & not declared in form pool &

What causes this issue?

User exit &V1& is either not defined or not declared in formpool &V2&.

System Response

Code for calling up the user exit is not generated or the selection
check contains a syntax error.

How to fix this error?

You define your user exit when you create user exit &V1& in formpool
&V2&, which is entered in table T80D.
You declare your user exit &V1& or the passing parameters required for
it when you make an entry in the FORM routine GET_EXIT_TITLES in
formpools &V2&.
You can find more information about user exits under the keyword
<DS:DE.EX_PROG>User exit formpools </>.

Error message extract from SAP system. Copyright SAP SE.