Invalid name of function module & to be called

What causes this issue?

The function name specified in the function call is not permitted for
function modules.
INCLUDE 'NA_FU_NO' OBJECT DOKU ID TX LANGUAGE E

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?

INCLUDE 'NA_HA_TST' OBJECT DOKU ID TX LANGUAGE E
RESET N1
INCLUDE 'NA_HA_POS' OBJECT DOKU ID TX LANGUAGE E
In this process instruction, check the definition of the function
module to be called and correct it if necessary.
INCLUDE 'NA_STREZ_NEU' OBJECT DOKU ID TX LANGUAGE E
<DS:TRAN.COR2>Change process order</>
INCLUDE 'NA_HA_PROD' OBJECT DOKU ID TX LANGUAGE E
Errors in the process instruction cannot be corrected for the current
PI sheet.
INCLUDE 'NA_PLNREZ_HINW' OBJECT DOKU ID TX LANGUAGE E
<DS:TRAN.C202>Change master recipe</>

Error message extract from SAP system. Copyright SAP SE.