There are two things that I see in your process:
The operation
process
seems to be defined as a two-way operation. That means that you need to have two receive-reply activity pairs. You have added an additional receive but now the reply for the original receive is replying to the new one and the initiating receive has no reply.You will need to use a correlation set for the second reply. Correlation is an easy topic although you need to learn it. Please see some documentation about BPEL Correlation Sets.