Add Item from catalog view throws strange error messages (Doc ID 801288.1)

Symptoms

The customer is having this issue with his Siebel version 8.0 custom environment, i.e. he is getting the following error messages when trying to click on "Add Item" for a specific customer / account into an order:

Error:

Error invoking service 'ISS PSP Dispatch Service', method 'CallPSPWorkflow' at step 'Dispatch Service'.(SBL-BPR-00162)
Error running sub-process 'Check Eligibility & Compatibility - Default' at step 'Product E+C'.(SBL-BPR-00183)
Error running sub-process 'Product Eligibility & Compatibility - Default' at step 'Product E & C'.(SBL-BPR-00183)
Error running sub-process 'Product Compatibility - Default' at step 'Compatibility Workflow'.(SBL-BPR-00183)
Error invoking service 'VORD Projected Asset Cache', method 'Retrieve' at step 'PAC Retrieve'.(SBL-BPR-00162)
There were more rows than could be returned. Please refine your query to bring back fewer rows(SBL-DAT-00500)

Steps:

Here are the steps to reproduce the issue:

1. Login to the application.
2. Query for a specific customer / account
3. Try to create a new order and try to add an item using "Add Item".
4. You will get all the above mentioned error messages.

Cause

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