Join stage warning

[subrat]

Can anyone put a quick light into it. Looked into existing entries but didnt really satisfy with those

I am having an issue in below point of a join stage (warning below)

XML stage ---> Transformer ---> Join stage

In transformer:

Preserver partitioning = clear
In Output tab = Preserve sort order(Enable)
RCP (Enable)

I have 3 such transformers which outout to a join stage

In Join:

Join having implicit sort and Unique enable as well with Hash Partion.

warning:
jontes: When checking operator: Operator of type "APT_JoinSubOperatorNC": will partition despite the
preserve-partitioning flag on the data set on input port 0.
buffer(22): When checking operator: Operator of type "APT_BufferOperator": will partition despite the
preserve-partitioning flag on the data set on input port 0.

Wondering even if the partion clear in upstream still getting warning.

[kwwilliams]

There are two input streams into the join stage, are they both XML-->Transformer-->Join, with hash partitioning and sorting on the join input link and clear partition on the transformer output?