You are going to have to adjust what and how you enter these items: in the product entry/setup screen you have these:
Code:
Product Qty Minimum: .25
Product Qty Maximum:
Product Qty Units: 1 or maybe .25
I forget the last setting that works but seem to recall that for your use that "1" will work then in your quantity on hand you need to enter the same unit that you sell by and for you this is square metre...I would also add some text explaining how this is offered and sold as currently one does not see that this is in sq/m