Variant at VA02 initial screen

Hello Gurus,

I would like to know if there is way to create a variant on the initial screen of VA02 transaction.

When I open this transaction, I would like the field "Order" to be opened with a Sales order number already filled.

And to go further, if I can link a SAP account with a variant.

For exemple I connect with account named "account1", if I open VA02, the sales order number field we be automatically filled with 1000

If I connect with "account2", and I open VA02, the sales order number field will be filled with 1001 automatically.

Maybe I can use a parameter in the account parameter in SU01 to link an account with a SO number ?

The field must stay modifiable to enter another order number.

Thank you for you help.