SAP Function VORPERIODE_ERMITTELN - Determines the previous period for a period according to T009B

Parameter	Reference	Type	Length	Default	Optional	Text
EPERIV	T009-PERIV	C	2
EPERJJ	T009B-BDATJ	N	4
EPOPER	T009B-POPER	N	3

Parameter	Reference	Type	Length	Text
IVORPR	PPER-PRPER	N	6