Mutiple transcation update using bdc

Dear Gurus

I have two questions .

1. Can we update two transaction code using CALL TRANSACTION method in BDC?

through searching in the forum i found that it not possible to update multiple transaction using CALL TRANSACTION method to update two t code simultaneously i have to use BDC session method , because CALL TRANSACTION method uses Asynchronous method for update data.

2.Suppose I am updating multiple transaction code using session method at first i create sales order using va01 when sales order is created how i collect this sales order no to use in the second t code in session method.

Thanks in advance.

Chitta Ranjan