You may find that you want to "trade" or exchange Inventory items or Raw Materials with another Company, for example, a hop trade. If there will be no monetary exchange, you can use a Goods Issue to remove stock and a Goods Receipt to bring the traded Inventory into stock.
The Goods Issue will always issue inventory out at the item cost. You will just need to bring it in at the same cost on the Goods Receipt.
To help ensure this exchange is recorded correctly, the best practice would be to prepare each document side by side. Then, prior to adding them right-click on each and select Journal Entry Preview, you should see the numbers match (although opposite debits and credits).
Please submit a Support ticket if you would like your Test database refreshed to practice this before performing in your Live database.