Variable type exit with two source variables

Question

I have a case where I should determine a variable (A) value according to two other variables (B) and (C). That is, e.g.
- IF (B)=x AND (C)=y THEN (A)=z
- IF (B)=i AND (C)=j THEN (A)=k
It seems like I cannot call the user exit with more than one exported variable, the standard call below:
call function m_user_exit
  exporting
    i_area      = m_area
    i_variable  = m_variable
    i_chanm     = l_chanm
    ito_chanm   = mto_chanm
  importing
    eto_charsel = rto_value
Any suggestions?
Regards, Aki

Answer 1

Thanks to everyone especially to Natarajan,
Both source variables are type exit, so I did the following:
A-variable was the “standard source”
B-variable was determined by function call (source below)
C-variable then determined by combination of A and B
I added this simple code in the beginning of “your own logic”  and I had source_var_B as a “B-variable”.
DATA: source_var_B TYPE upc_yto_charsel.
call function 'ZDETERMINE_B'
  exporting
    i_area      = 'AREA'
    i_variable  = 'VAR_B'
    i_chanm     = 'CHAR_B'
    ito_chanm   = ito_chanm
  importing
    eto_charsel = source_var_B.
Do you see any risks or inconsistencies or whatever I should take into account?
Aki