Linked Button error in a subReport with Crystal Reports

Hi expert,

I have a designed a subreport with Crystal Report, and I have add the Sap Linked button (OLE Object), to allow the user to click on the linked button and open the relativa Sap Document (Invoice, Delivery, etc etc).

In the hypetetx linked property, I have write the link

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'http://$b1$/link=OINV&key=1'

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In this way all is ok, but In my query I have the name of the table and the DocEntry, so I try this way:

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'http://$b1$/link='&{Comando.Table}&'&key='&{Comando.DocEntry}

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If I try to open the document, I retrieve the error: You are not permitted to perform this action. Authorisation Path: Help.

I don't understand if the problem is the authorization (i am manager, superuser) or if I had write in a wrong mode the hypertext link. (maybe the Apex?)

Anybody can help me?

Regards

Marco