Correlation condition in Aggregate Pattern

Hi Team,

Just Started the Aggregate Pattern and

My Requirement is to collect the 3 messages of Pencils based on their color(should be same for three messages)

Below is My pattern:

Start:

I have initialized the Counter to zero

CurrentPencilID is of type string(what should we initialize here?)

Numberof Pencils is of type integer(what should we initialize here?))

Mapping

I have Incremented the Loop and mapped the outputs.

Exclusive choice

Here I have given the condition for the loop if counter reaches the count 3 it will send the message and end the activity.

Else

Intermediate Step.

Here the incoming message should match the correlation field and But I am unable to do so.

Please help me out for this condition evaluation.

As it should collect messages of three Blue Pencils and aggregate all three messages and send to the target.

Regards,

Novveen