How to write data input screen form

Dear Sir,

We need to develop a Foem which can allow data input to the user . The form will have 3 rows and each row has two field (Material Number and Standard Price field) .

We need that after after entry of each Material Number , it should be validated and invalid value should not be allowed .

At the time of Clicking of SAVE button , the data entered earlier in the 3 rows , should be inserted into Z Table .

I request SAP gurus to kindly help me with a sample code for the above scenario . Or kindly suggest me some refrence help site where I can get some help to address my requirement .

I assure to give full points for the suggested answer pl .

Rgds

Sonia Agarwal