Calling Customer Function of R/3 in WDA

Hi All,

I am developing an HR application to maintain employee bank details and using 'HR_Infotype_Operation' to update the infotype.

But client has put lot of validations in R/3 using user exits and they need the same validations in WD application also.

"HR_Infotype_Operation" is not checking the R/3 validations and updating the values without account number, payee name which are mandatory in R/3 besides lot of other validations.

Could you please check if there is any way we can call the same validations in WDA instead of writing the same code all over again?

Regards

Alok Sharma