Inventory Transfer

Hi experts, having problem in my SDK when I'm posting to Inventory transfer. I've use to copy from in my add-on from Inventory transfer request. By when I'm posting to Inventory transfer, I'm having this error "Invalid item code '1250000001' in Enum 'InvBaseDocTypeEnum'. The valid codes are '0'-'-1', '1'-'0', '2'-'20', '3'-'59', '4'-'67', '5'-'1250000001'"

Here's my Code in that particular line error.

oLines.BaseType = 1250000001

Hope someone will help me.