Movement Type - PO transfer

dear friends,

1. where can change Movement Type used in PO transf (MM-SD)? today i have used copy the mov 641.

2. in Account Grouping (OMJJ)... Transaction/event key GBB - VBR showing G/L account different(OBYC). (the valuation class have correct and similar from material master). WHY? Its not correct...

regards.