CJ20N / User fields PS

Hi,

via customing (transaction OPS1) we created a new tab in the project builder (CJ20N) with some new (text) fields. This is working just fine. Another requirement is to add a F4 help to these fields. The F4 is displayed which is the standard way after defining these fields. But when pressing F4 a searchhelp / domain, or whatever should be displayed in which the user can select an entry. My question would be, is this possible an if so how to do this?

We're interested in field USR00 of table PRPS. For this field an F4-help must be defined and called.

Kind regards,

Micky.