Solution : https://service.sap.com/sap/support/notes/541861 (SAP Service marketplace login required)
Key words : 
respective sales order, assembly order, transaction cohv, terms cor2, cor1 reason, program error, solution implement, program correction, availability data, availability check
Related Notes : 
       
| 552649 | COHV: Resetting availability data for assembly orders II | 
| 306639 | Incor.reqmt qty rounding co-products/by-products | 
| 73033 | Component quantity in production orders |