Solution : https://service.sap.com/sap/support/notes/305206 (SAP Service marketplace login required)
Key words :
involve user exit exit_saplea69_001 defined, additional key words proration, billed correct arithmetic operation, copying delete field zeitant, existing data element e_zeitant, prerequisites field erchz-zeitant, current time portion calculation, delete field zeitant, existing domain e_zeitant, enhancement ebia0006in addition
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