Solution : https://service.sap.com/sap/support/notes/518237 (SAP Service marketplace login required)
Key words :
dictionary objects -> matchcode object vmva, delete database table -> direct, transaction se38 -> program sapmaco, create database table2, vmva client function, long runtimes occur, transaction se11 -> utilities ->, calling field maintenance, vbuk root table, mc_update_vmva function module