Ok just so we are clear and I'd like a comment by the moderator or microsoft personnel if possible. I want to summarize everything.
If an item is marked catchweight in D365 F&O you cannot create workable unit of measure conversions to be sold. It will allow you to create the conversion but you cannot enter the other unit of measures on the sales order lines or purchase order lines. Therefore in catchweight per item you are limited to 1 unit of measure.
If an item is not catchweight in D365 F&O you can create workable unit of measure conversions but the system cannot price the unit by the lb unit at the sales order entry or PO line level. (You can only do that if its marked catchweight).
Also if you create an additional unit of measure conversion like box for a non catchweighted item you cannot pick the box unit of measure (that is on a sales order and it defaults to picking cases only) natively through the pick and pack IU.
However if you are using the advanced wms scanning you can pick the boxes that are on the sales order line.
Microsoft, please confirm and add any comments. Again, all I'm trying to do is be able to sell boxes and cases on the sales order and purchase order lines and price them by the lb unit of measure using the same item code. If you guys can fix this you will have the entire seafood industry waiting to implement your product.
Eugene thank you very much for your feedback.