about sales order

I am having two fields;

1.date of canc.doc of type veda-vbedkue

2.billing plan of type fpla-tndat

my job is :

the above mentioned two field are in two different tabs in my sales order

I need to select date from the calender in date of canc.doc field, the billing plan field will automatically updated with date whatever we select date in date of canc.doc field.

Plz help me.

Moderator message : Requirements dumping not allowed, show the work you have already done, discussion locked.

Message was edited by: Vinod Kumar