SAP Function /SAPHT/SW_BL_PL_TY_SP_HEADER - Design item 22, Move vclassific from lknvv to kuagv

Parameter	Reference	Type	Length	Default	Optional	Text
I_LKNVV	KNVV	u	241

Parameter	Reference	Type	Length	Default	Optional	Text
C_KUAGV	KUAGV	u	589

Functionality
This moves the billing plan type from LKNVV (current billing plan typefrom
database) to KUAGV (Sold-to party's billing plan type for headerlevel).
In ISSW release on R/3 4.6B, this was named EXIT_SAPLV05E_401.