Solution : https://service.sap.com/sap/support/notes/517182 (SAP Service marketplace login required)
Key words : 
abap error message convert_overflow, post material documents, applicable attached correction, program termination occurs, program error, key figure, valuated stock, terms cwbwbest, invco reason, solution implement
Related Notes : 
       
| 542507 | IS-OIL / IS-MINE: CRTs 41-43 for SAP_APPL Support Packages | 
| 520503 | IS-OIL / IS-MINE: CRTs 38-40 for SAP_APPL Support Packages | 
| 496437 | MCBEST - key figure values calculated incorrectly |