Getting description based on input value

Hey all,

1. This time I wanted to ask how to get to display description of the entered value in the custom text field?

E.g.user inputs a account group of 1010 and in the next screen client wants that the description of this account group is shown. Below is a visual example.

2. And also I would like to know how to deal with "remembered values". E.g. tcode VA41 - when in first screen contract type is selected -> proceeded to the next screen for entering details of contract -> exit without saving, then when next time entering VA41 the previously selected contract type is still appearing in the field. Hot to make it to be blank every time?

Thanks!