PDF form to RFKORD program in correspondence

Hello,

Can anybody help in following.

We have to create 6 different annexures which we are creating in PDF using SFP tcode. We tried one annexure to "ABC"(newly created) correspondence type. Assigned the RFKORD40 program and variant to corresponding type.

When we run the correspondence it call the basic script and not the PDF.

Please suggest if we missed any setting.

Thanks