How can I enable custom Transaction Types to appear in the search bar of Confirm Pick Slips?

When attempting to search for Confirm Pick Slips in Inventory Management > Task Menu > Confirm Pick Slips, I added a filter field for Transaction Type. However, the List of Values (LOV) only displays the standard Transaction Types and does not include the custom Transaction Types that were expected to appear. Ideally, both standard and custom Transaction Types should be available in the LOV for selection.