AppError and PAS

Dear,

A question about AppError. My apologies if this is a double call remember me something about it.
I am making a REST call to my backend where I trow an AppError.

A easy and straight forward example of an AppError in a service interface.

    oAE = new AppError("RETVAL error").
    oAE:AddMessage('first error', 1). //
    oAE:AddMessage('second error', 2).
    return error oAE.

But if a test this call I don't get the reponse I was expecting. If I extract this in ABL all the data is there.

Is this expected behaviour? That only the first error message is passed to the frontend.

Kind regards
Kevin Hermans