doubt on dialog

hi experts

I am new to the dialog programming.

My requirement is

1) I have Sales document as Input in the Screen (vbeln)

2) After enter vbeln then I press enter key, then i need to display the Sales

document details like Material and its Description Order qty in the table

control tc1.

3) I have ztable also called zctlp but not having details of vbeln,material and all.

4) These details i need to pick from vbap or some other tables.

How to do this, pls help me on the same.

Thanks in advance

Regards

Rajaram