Hi Mike
We have not had this error and the Z_AW_RFC_READ_TABLE function is also not available on my system. However, I came across below info from the IS Admin guide and this states that your user should be set to run in background...
"10.4.7 Using SAP applications as a source
SAP BusinessObjects Information Steward allows direct integration with the SAP Business Warehouse and the SAP ERP Central Component (ECC) system. One of the main benefits is the ability to connect directly to the production SAP systems to perform data profiling and data quality analysis based on the actual, most timely data, instead of connecting to a data warehouse, which is loaded infrequently. To fully utilize this advantage without risking the performance and user experience on the production ECC system, consider these requirements.
To use utilize the back-end resources in the most efficient and sustainable way, the connection user defined for the interaction between Information Steward and the SAP back-end system should be linked to background processing. This is the recommended setup for the connection user. ..."
Hope this helps.
Regards
Danie (Ja, is frikaans , en jy?)