Several dialog sessions in ECC from PI

Hi everybody,

We create an interface from a Legacy system through PI to ECC. The legacy system invokes the interface sending some info through PI and arrives to a ECC. It sends just one message, but in ECC we see 3 or more dialog sessions. Can anybody explain me why this happens?

We need to understand why this happens because when legacy send more than one message we face locking problems. So we need to solve this.

Can anybody help me??

Regards

Edgar López