Delivery group for materials have only one item

Dear SD experts,

There's a issue about creating sales order va VA01. We use LSMW to create the sales order automatically.

But the delivery group can't be generated automatically. So I have to put the group number 1, 2, 3....into excel.

Then the issue comes out:

For the materials has only one item, we also put the delivery group in.

I want to know is that ok? It has some bad influence for the sales order or not? if so, how to set the program to avoid the "only-one-item" get the delivery group?

Best regards,

Peter