Solution : https://service.sap.com/sap/support/notes/45880 (SAP Service marketplace login required)
Key words :
additional key words mver, create material masters, internal table wmat, function module mver_refresh, prerequisites program error, program saplmg34, direct input, data transfer, increasingly slower, large datasets
Related Notes :
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| 45901 | Direct input for forecast data - perf. problem |