How to set focus on a custom PO Item screen field when in error?

Question

Hi All,
I have an interesting situation that i'm wondering if others have solved.  We have extended the PO item table (EKPO) by adding two new fields.  We then have implemented two BAdI's:  ME_GUI_PO_CUST and ME_PROCESS_PO_CUST to add them to the ME21N/ME22N/ME23N screens and logic to do some validation, via these respective BAdI's mentioned.  Everything works perfectly - with one small issue.  When we are doing some validation via a method on the ME_PROCESS_PO_CUST - and "invalidate" the field (and throw an error) when it is in error - I also want to be able to "set focus" on the field in question (basically: go to the particular tab on the ME* screen and highlight the field).  I have tried using SET CURSOR FIELD *****  within this BAdI (ME_PROCESS_PO_CUST) - but doesn't seem to work.  Has anyone tried to do this and have come up with a solution?  Would be much appreciative if you shared it!!!  Thanks much.
Cheers,
Matt
ERP version that we have is:  ECC 6.0

Answer 1

Just have a look at oss note 310154 - ME21N/ME51N: Customer-specific check, generating error log.
In short:
Add your error messages in EXIT_SAPMM06E_012 (using specific macros).
Sample code (provided in Oss note) :
  loop at tekpo where knttp eq 'X'.
    loop at tekkn where ebeln eq tekpo-ebeln and
                        ebelp eq tekpo-ebelp and
                        kostl eq space.
      if not tekkn-id is initial.
        mmpur_business_obj_id tekkn-id.
        mmpur_metafield MMMFD_ACCOUNTINGS.
      endif.
      mmpur_message_forced 'E' 'ZE' '777' '' '' '' ''.
    endloop.
  endloop.