Merge/aggregate messages in XI based on common field value

Hi everybody,

Is it possible to merge/aggregate several messages into one in PI/XI, based on a common field value the messages have? if so, can this be done in the mapping?

Example (scenario): I am receiving multiple messages, some of which have the same value in the field GroupId. Is it possible to aggregate the ones that have the same GroupId into a single message? and send one message with multiple items inside instead of multiple messages.

Thank you in advance,

Ion