You install the 32-bit version of the BizTalk Accelerator for HL7 (A4HL7) on a 64-bit computer. If you run an instance of BizTalk Server Host in 64-bit mode, an inadequate error message that resembles the following may be logged in the BizTalk Server event log:
A message received by adapter "adapter_name" on receive location "location_name" with URI "location_url*" is suspended. Error details: There was a failure executing the receive pipeline:"BTAHL72XPipelines.BTAHL72XReceivePipeline, BTAHL72XPipelines, Version=1.3.0.0, Culture=neutral,PublicKeyToken=31bf3856ad364e35" Source: "BTAHL7 2.X Disassembler" Receive Port: "location_name" URI: "location_url" Reason: The ConnectionString property has not been initialized.