Material types is assigned to A/c Cat Ref, A/c Cat. Ref is
assigned to Val. Class; Val. Class is assigned to G/L A/c.
Val. Area also assigned to Val. Grouping code. Val.
modifier assigned to Val. class as well as G/L A/c.
OMWM : Activate Val. grp. code
OMSK : Create New A/c Cat. Ref; Val. Class. and A/c Cat Ref
is assigned to Mat. type.
OMWD : Assign val. area (plant) to Val. grouping code (0001)
OBYC : Assign Val. Modifier (0001), New Val. class, New G/L
Now you can create new material and assign new val. calss
in Accounting 1 view. For this material you can create po,
and GR now debit in your GL account.
check on it.
Value String Indicates the posting rule that always contains the same account assignment characteristics for a certain transaction or event (for example a goods movement or an invoice receipt). The Value string is needed for the purposes of automatic account determination.
In SAP every movement of goods is followed by one movement type and movement type trigged transaction event keys and can be checked in OMWN t.code. G/L account assignment and G/L account assigned to transaction event key with valuation grouping code, valuation class and account mofidier in OBYC t.code.
Account modifier is a key which break account determination down by movement type.
For more check the links;
Please find the below link for more under standing
moventtype will be assign to the valuation string based tthe posting method
transaction event keys are assignn to the valuation string in either side
the valuation string will be work as intermediate between movement type and the tranaction event key
for the all the transation eventkeys based on there usage valuation class and gl account combination will be defined
based on that posting will be happen for the gl accounts