Step 1 should wait until step 2 completes

Hi,

Please anyone help me...

I have two receive steps.

Both has inputs like Type,Number and Quantity.

Receive step 1 starts wen Type=A

Receive step 2 starts wen Type =B.

If i run step 2 after step 1 it will complete the process but i want to wait step 1 until the step 2 completes.

If "step 1 Quantity = step 2 Quantity" then the it will move to the next step.

For example:

Receive Step 1 Quantity=10

then i can give Receive Step 2 Quantity=2, then 3,  then 5

Now step1==step2

so now it can proceed the next step.