Answer / kanika

To create a field Exit pls follow the steps
1)For field exits in R/3 4.6C, execute transaction CMOD.
Then type PRFB in the command field.
2)on the top menu...click on Field exit-> create ->enter
the name of data element
3)enter the data element required for screen field to be
mandatory and Execute
4)another screen comes with a function module name
FIELD_EXIT_name of data element
5)Click create and save it to corresponding function group
6)you will get a function module with
import parameter as : INPUT
export parameter as : OUTPUT
7) in the source code write the code :
if input is initial.
message 'SALES FIELD MADATORY' type 'E'.
endif.
8)again to activate execute transaction CMOD. Then type
PRFB in the command field. on the top menu...click on Field
exit->Activate
now wherever data element is used the mandatory check will
come but you need it only for your program ,so in the same
screen click on Assign prog./screen tab and write the name
of the program and screen number where you want the
particular check

I believe field exit are not possible if structure field is
on the screen...please do the above and check..you can also
run the report RSMODPRF to create a field exit

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