Solution : https://service.sap.com/sap/support/notes/36429 (SAP Service marketplace login required)
Key words : 
prerequisites program error solution corrected, additional key words credit limit, purchase order requirements/assembly orders, purchase order requirements, creating sales documents, sales activity processing, assembly orders, assembly order, program rvinvb00, sales order
Related Notes : 
       
| 53201 | Availability check during release | 
| 43313 | 3.0D: Cred.rel. assemly order, missing prod. order | 
| 31248 | Release, another check and block, performance |