If you are unable to save your invoice you probably aren’t filling in all the required fields.
Top Fields Required: You must have a vendor. You need an invoice number. Order date.
Line Items Required:
Item# (To keep track of pricing we need a unique number indicator for each item #. Your vendor doesn’t have line item #s? You need to self assign a number. Why? A unique indicator helps keep track of individual items.
Everything else on the line item entry is required. Feel free to enter 1 for any info needed as well.