SUMMARY:
This behavior, that impacts every Strategy version, is working as expected because the implementation of big decimal only supports value prompt, but not other type of prompts like attribute qualification and set qualification. However, a simple workaround is available in the current document if users want to leverage the functionality.
SYMPTOM:
The user tries to drag and drop a Big Decimal prompt into the custom expression field available on an attribute qualification filter but it is unable to do it.

STEPS TO REPRODUCE:

CAUSE:
This is working as expected, the implementation of big decimal only supports value prompt, but not other type of prompts like attribute qualification and set qualification.
ACTION:
Apply the workaround provided below.
Input the big decimal prompt into the filed as follows '?[value prompt name]'

The Strategy Internal Reference Number for the issue discussed in this technical note is 935136