A  problem has been discovered in Micro Focus Mainframe Express Enterprise Edition 3.1 WebSync 7 or earlier.  A function call in the right hand side of a UPDATE SET clause ends in sqlcode -440. However the same function is working in SELECT using the same parameter.

So for a correctly defined User Defined Function named UDF1...
  
      *    UPDATE can find but not execute function UDF1
           EXEC SQL  UPDATE  TABLET1
                SET  ADDRDESCN = UDF1(:ADRDESCN)
              WHERE  ADDRTYPE = 20
           END-EXEC.

      *    SELECT can find and execute function UDF1 correctly.
           EXEC SQL
                SELECT ADDRTYPE ,ADDRDESCN
                      ,UDF1 (ADDRDESCN)
                 INTO :ADRTYPE ,:ADRDESCN, :FCTRETURN
                 FROM  TABLET1
                 WHERE ADDRTYPE = 20
           END-EXEC.

This problem was resolved in WebSync 8 for MFEEE 3.1.  Go to the Support Line website to download and  install the latest maintenance WebSync.