Pricing is applicable across Purchase and Sales for Catchweight and should be setup using the standard functionality available within Business Central. When using Catchweight functionality, you must setup pricing according to the Catchweight Unit of Measure that has been setup against the Item.
The pricing will then be used on sales and purchase documents, and be shown on a new field called Price per Catchweight against the relevant Item. The Price per Catchweight can also be changed on both the Sales/Purchase document lines - so if pricing is agreed on a trade-by-trade basis you are not required to setup pricing in advance.
Note: when posting Sales and Purchase Invoices for catchweight Items the price that will be used for the calculation will always be the Price per Catchweight. If the Price per Catchweight is left blank (Zero), when Invoiced, the Invoice Price will be Zero.