How to auto populate Primary key in the RAP framework

[nagaraosunkara]

Have the following question reg the RAP framework, is there any possibility of autopopulating one of primary key fields in the backend in the RAP framework.

Eg: Table 1 has primary keys K1, K2 and non keys as F1, F2. In the Fiori screen, users will enter the value of K2, F1 and F2, and in the backend the value of K1 should be automatically populated to 'A'.

Is there any possibility of populating the K1 using behavior definition?

Thanks & Regards,

Naga