Informix form

I have an interesting Informix form problem. Please advise me what I should do. Problem: ------- Our system consists of more than 1 databases such as Hivres, RV26, RV18 and so on. In the Hivres database we have a table call enroll. This table will keep informations about our clients and each client will have an ID. From the Informix form, before records are added into their tables, a C-function is called to verify the ID from the Informix form and the ID in enroll. If not found, the error message will be displayed. There is no problem if the Informix form and the Enroll table point to the same database. If I open the informix form in different database (RV26) and use a C function to open the table Enroll in Hivres to verify ID point then we get error. It shows me that Informix loose control the pointer when I switch from one database to another and return back to the original one. I know that Informix can not open more than one database at a time. Is there any way to solve this problem. Thanks anyway