Combining 2 PDF forms

[contien]

I have created 2 PDF forms in LiveCycle ES.  When I try to combine the 2 PDFs in Acrobat Pro 9 (File > Combine >  Merge Files into a Single PDF) I get an error message that Adobe XML forms cannot be merged.  How can I combine the 2 forms into a single 2 page PDF?

Thanks!

[Shekharmine]

this cannot be done in acrobat. LiveCycle only