Solution : https://service.sap.com/sap/support/notes/124486 (SAP Service marketplace login required)
Key words :
additional key words transaction mc93 / mc94, system generates error message ma120 'period, pressed key 'save', period variant &, program error, change values, planning table, solution repair, source code, determined
Related Notes :
| 160835 | Error message MA113 issued with incorrect factory calendar I |