Programme SAP CRM_BE_XPRA_TBILL - XPRA for field direction in table tbill002 and tbill004

Purpose
The tables TBILL002 and TBILL004 get the new field DIRECTION in Release4.0.
Since existing customizing from Release 3.0 or 3.1 is valid for thedirection 'outgoing',
the tables are converted so that every tableentry gets the value '01'.