Standard transaction CG02 is not saving the data through F4 help.

Hi Guru's,

I have a standard transaction CG02 for this i need to maintain the data for few of the fileds like Heat sensitive, Thermal energy hazard etc for updating Derived C-Alpha code. So for i can able to maintain data in two ways either directly or through F4 help. when i supply data through F4 help, on the F4 help window im providing the value and clicking on continue button. when i press on the contine button it has to update the Derived C-Alpha code if all the required fields filled. If suppose i do nt fill the required fileds it has to through the error message on the status bar like 'Invalid Data Combination'. Now the problem is when i clicking on continue button of F4 help window im displaying error message. when i try to change the value or try to fill the required fields so for im clicking on F4 button then its directly taking me out from the transaction. If i press on any key also samething is happening but the same is not happening when i supplied the value directly and saving. Please let me know the reason and help me for the same with needful solution. If anyting required plz ask me i wil provide u.

Here we are using the user-exit EXIT_SAPLC107_001 and is used in FM C107_CUSTOMER_FUNCTION_CALL.

Thanks in advance.

Yours,

Somu.