Enhancing Talent Management Infotype 7408

Hello Experts,

I have a requirement to enchance the Talent Management Infotype 7408 and add 3 fields to the table(HRP7408) and screen. I've tried to create the enhancement in the PM01 transaction but all it always gives me errors.

If I try to enchance the screen structure the following error is shown:

     "Screen structure HCMT_BSP_PA_XX_R7408 must first be created"

If i try to enhance a single screen the following error is shown:

     "Infotype 7408 can not be enhanced"

Is there anyway I can enchance this infotype? Any other transaction?

Thank you and best regards,

David Pereira