Can we change business unit after copying the sales order?

Summary:

We have a requirement to copy one sales order to a different business unit as our selling entity and buying entity is different.

To avoid entering the data again, we want to copy the sales order to a different business unit.

Currently, I can copy the sales order but on the new copied sales order, business unit is already selected and is not editable.

Content (required):

Everything else is editable except for the business unit

Please help to resolve this?