diff --git a/docs/8.0/ayanova/docs/inv-purchase-orders.md b/docs/8.0/ayanova/docs/inv-purchase-orders.md
index cb73c2b1..2e5a1ee3 100644
--- a/docs/8.0/ayanova/docs/inv-purchase-orders.md
+++ b/docs/8.0/ayanova/docs/inv-purchase-orders.md
@@ -163,6 +163,20 @@ This field will be filled in automatically when the edit form is saved with a se
 
 Enter the actual received cost if it differs from the PO Cost when receiving or, this field will be set automatically to the PO Cost value if it's found to be zero or empty when the PO is saved. Received cost is for reference purposes here only, it does not affect any other record in AyaNova.
 
+#### Vendor number form field
+
+This optional field will be filled in automatically when the edit form is saved if AyaNova can match the purchase order Vendor selected to one of the Part records Manufacturer, Wholesaler or Alternative wholesaler fields it will then copy into this field the corresponding Manufacturer number, Wholesaler number or Alternative wholesaler number field from that part record.
+
+This field can also be filled in manually or left empty.
+
+On the stock purchase order report intended for the Vendor this field will display in a column titled "Vendor#".
+
+#### Serial numbers
+
+This optional field is used to record the serial numbers of the parts received. Serial numbers should be entered separated by spaces or commas. The server will break them into individual serial numbers and add any that aren't already recorded into the [serial number collection](inv-part-serials.md) for the part selected.
+
+Spaces or commas are not supported _inside_ a single serial number as they are considered the separator character _between_ different serial numbers entered.
+
 #### Receiving in the edit form
 
 In the case of a partial receipt, enter the quantity delivered in the `Quantity received` field. If all items were received click on the `Receive all` button at the bottom of the form (displayed when there is less received than ordered for this item) to automatically set the received quantity to the ordered quantity for this line item.
@@ -171,6 +185,14 @@ In the case of a partial receipt, enter the quantity delivered in the `Quantity
 
 Inventory is _live_ in AyaNova and received items affect inventory when first received and when edited later. If you modify a received purchase order item, for example adjusting the quantity or changing a part and save the record those changes will take effect immediately in the inventory that all other AyaNova Users have access to.
 
+#### Saving the edit form
+
+The purchase order edit form is unique in AyaNova in that it has it's own save button separate from the overall purchase order save menu item. This is because purchase order items often require looking up values at the server to complete the form. A save must be made in the purchase order item edit form before closing it to preserve the changes made.
+
+PO item fields are filled in upon first **save** of the PO Item. When first saved the Vendor Number and Cost fields will be updated (overwriting anything entered manaully in them before save) automatically. After that point it's safe to edit the vendor number of cost manually as it will not be overwritten in subsequent saves.
+
+### Items table columns
+
 #### Part
 
 This column displays the selected [Part](inv-parts.md) being ordered.
@@ -213,7 +235,7 @@ The single per unit actual cost at receipt entered for this po line item.
 
 #### Tax code
 
-The [Tax Code](acc-tax-codes.md) in effect for this purchase (not the tax code used to sell this part).
+The [Tax Code](acc-tax-codes.md) in effect for this _purchase_.
 
 #### Net total
 
@@ -230,13 +252,3 @@ This is the line total Tax B amount calculated by multiplying the Tax B percenta
 #### Line total
 
 This value is the total sum of the Net total + Tax A amount + Tax B amount. This value is calculated at the server and will display once a record is saved.
-
-#### New item
-
-00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
-
-## New PO Item first save
-
-PO item fields are filled in upon first **save** of the PO Item. When first saved the Vendor Number and Cost fields will be updated (overwriting anything entered manaully in them before save) automatically. After that point it's safe to edit the vendor number of cost manually as it will not be overwritten in subsequent saves.
-
-Note that the "Vendor Number" will only be filled in automatically if the selected vendor for the PO is either the Part's matching Wholesaler or Alternative Wholesaler