can't digitally sign pdf included in a pdf portfolio

I am using Adobe XI, i can't digitally sign .pdf documents within a .pdf portfolio. This is the first time I have tried this in XI - worked perfectly in Adobe 8.
Gelly77Asked:
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Gelly77Author Commented:
This appears to be a known issue with Adobe XI
https://forums.adobe.com/message/6547211#6547211

No resolution yet.
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