Purchase Order field in Sales Order Entry

Hello all,

I know that the "PO Number" field within Sales Order Entry is used for Auto-generating PO's from Sales Orders and creating drop ship PO's from a Sales Order, but I wanted to know if it has any other purpose?  I wanted to use this field for another internal process, but wanted to make sure that using this field doesn't inadvertently activate something else in Sage 100 that I didn't want.  I want to be using this field to reference to the rest of my sales staff that these line items in the Sales Order have PO's already placed to the vendor and I'd put the specific PO# in that field.  Can anyone advise?  Thank you.