Outbound delivery

Dear All

i am doing STO from one store to another store my STO Qty for Material ( A is 10 ea.)

But when i do OBD it captures details from STO say Materail A = 10 , But when i change it 15 it takes that and is not givind me ane error.

My Question is my OBD Quantity should not be greater that my STO Qty , if it is so it should give ma an error.

so , can you tell me what cofiguration i need to do.

Regards

Tara