Solution : https://service.sap.com/sap/support/notes/94634 (SAP Service marketplace login required)
Key words : 
batch input session 'price change, batch input session terminates, error message m3271 'function, ' additional key words rmmr2100, customized material master records, batch input session, customized material master, -r3 standard -> programs, price change, report rmmr2100
Related Notes : 
       
| 38229 | Customized material master: concepts |