I'm not sure who decided that the new form was an improvement, but I am fairly certain that they were wrong...
Once upon a time in RMS, when adding items to a PO/Transfer, you would click the Add Item... button, to the Lookup... button, hit , start typing your ILC and then hit to add the item. If you had two items ABC-111112 and ABC-111113, you could type ABC-1, hit your down arrow, and be done with it. Another keystroke got you right back to the item list and so it went. Nice an smooth, no need to reach for the mouse and waste a bunch of time and movement selecting items.
Now... You start typing your ILC. If you get close, the arrow keys don't work, is no good (must use Alt-S to 'Select' or tab several times to get the 'Select' key active for your key.
And the worst thing... YOU ABSOLUTELY CANNOT TAB INTO THE ITEM LIST to use your arrow keys.
This 'improvement' is not good. I can kind of see where the designers were trying to go, with a list of items that only apply to the selected supplier, but the execution is poor.
Specific suggestion: On the PO Add Items form, the 'Enter item lookup code or select from list:' field NEEDS to accept an Up- or Down-Arrow keystroke as an instruction to select the next item up/down in the list box below. Once an item is highlighted, an key NEEDS to add the item to the Selected Items list and reset the cursor in the 'Enter item lookup code or select from list:' field ready to accept the input of the next ILC. No mouse clicks required.
If I wanted to be required to use my mouse for every other action, I'd have bought an Apple.
General suggestion: You should NEVER be REQUIRED to use the mouse for ANYTHING. Ever.
Tom