Validation Error Messages of Manual Entries in F4 enabled Fields

Question

I have a view on which someone has set up F4 help.I see where the GET_V method has been created to establish the pulldown values
CALL METHOD /almgt/cl_common_util=>get_f4_help
    EXPORTING
      iv_type                 = if_bsp_wd_valuehelp_f4descr=>help_id_kind_comp
      iv_index                = iv_index
      iv_keyfield_name        = 'PL_SP_HANDLING' "context attr for Job Position
      iv_textfield_name       = 'PL_SP_HANDLINGT'
      iv_help_id              = '/ALMGT/C_SPCTY-PL_SP_HANDLING' "name of check table and key field name
      iv_only_active_records  = abap_true
    RECEIVING
      rv_valuehelp_descriptor = rv_valuehelp_descriptor
If a user does not use the pulldown, and types in an unallowed value, a message is delivered that says
& code & is either invalid or inactive   (the ampersands are filled in).
We want to change these messages but I can not find where they are being thrown from.  Where do these validations generally take place ? DO_VALIDATE_INPUT is empty.
Thanks...   ...Mike
CRM 7.0
FRM (Fundraising Management)
(Comp: /ALMGT/BT115H_SLSO , View /ALMGT/BT115H_SLSO/Details,
Context BTSALESSET, Attribute: STRUCT.PL_SP_HANDLING)

Answer 1

I had originally trapped CL_BSP_WD_MESSAGE_SERVICE ADD_MESSAGE() and was getting no hits.  It turns out that the caller was using fm CRM_MESSAGE_COLLECT.  When I trapped that, I was able to find the BADI that was throwing the message ( CRM_SALES_BADI ).