WBI Adapter ODA - Error reading segment

Hello,

I am trying to create a business object using the ODA to get an iDoc definition from SAP 4.7

I have done this a few times for ORDERS05 and DESADV iDoc types but whne I try to get DELVRY03 it fails with the message "Error reading segment".

I am then advised to look in the trace but that tells me nothing usefull

Any idea's ?