TRX is an abbreviation of the term Transaction Processing. When sales orders are shipped, a transaction is recorded for each item on the shipment. Purchase order receipts create transactions showing the receipt of items. Work orders, projects, and point of sale transactions also create item transactions within the Inventory module. These transactions include the date, document (sales order number, purchase order number, etc.) quantity, cost, etc. of the transactions. All of these transactions get recorded in TRX and saved for audit trail purposes.
The transactions menu is home to a few transactions that are outside of the normal flow of business. These transactions include Receive Inventory and Issue Inventory and POS override adjustments. Processes can be used to create beginning balances of items or make adjustments due to entry errors. Inventory transactions that are entered on the Receive Inventory and Issue Inventory screens must be processed in batch mode on the Process Receiving's and Process Issues screens, respectively.