When you first arrive at the Transactions section of Marty, you will be on a page that features a large list of the transactions that ISS has on record.
Transactions are not simply inventory transactions, they can represent many different operations (assemble, purchase, pick, store, etc.
You can see which operation each transaction represents by looking in the "Operation" column of the list table.
Filtering
You'll notice that, right underneath the main navigation bar at the top of the page, there is a darker grey bar with some buttons ( receiving, labor) and other controls on it. We refer to this as the "filter bar". You can use these controls to filter the list of transactions to only include those of a certain type.
You can also use the search bar (underneath the "Add New Inventory Transactions" button) to filter the transactions to only include those that contain the search term in the part number, the serial numbers, or the document number related to the transaction.
Note: Can't find the transaction you are looking for? You may want to check the filter controls and the search bar. Perhaps a filter/search term is being applied that doesn't match your transaction.