SAP PI - Group records based on values of the source message

[pi_consultant1]

Hi all,

Ive an requirement to group and filter based on the source values:

Ive the following nested Stucture that needs to be mapped/grouped and filtered to the target nested structure:

The Source message can be like this:

And the target XML should look like this:

• When there is only TestId, the TestId and its Parameter should be passed.
• When there is both SampleId and TestId, only SampleId should be passed and all the corresponding Parameters of that SampleId should be grouped on. In this case 3 parameters for SampleId (S1) and 1 Parameter for SampleId (S2).
• Also when there is no TargetId field, the corresponding parameters shouldnt be passed (like parameter P3).

My preference is graphical mapping...
I would be appreciated if you can help me with this, 

Thank you,
John