I would recommend doing this the other way around. search for placements by custom text field and return the candidate in the fields parameter.
Let me know if you are able to search for candidates by placement this way!
Thanx for your quick response! If already tried that way. The strang thing about this if if get a candidate by ID i get the following placement data:
[placements] => stdClass Object
[total] => 1
[data] => Array
 => stdClass Object
[id] => 8781
[customText48] => Ja
[customText27] => Servicemonteur Materieeldienst
[customText13] => Ronald Bloemendal
[dateBegin] => 1612760400000
If e search/query by the customText48:Ja i don't receive any data?!
Any idea? Maybe field setting inside Bullhorn?
Based on what I am seeing here I do not see any errors or anything that would show that this would not work and would need to investigate further.
I would advise for next steps to reach out to our Bullhorn Support team and create a ticket so that we can look specifically into your request.