query is not working for Join type form (multiple IDs)

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Thank you for your 64bits platform supporting python ARS remedy project (pyremedy).
I'm using Centos7 docker platform to develop pyremedy with our remedy server now.
I can use query() to the standard regular type form.
But, in the case of the Join type form, it failed with the ARSError below.

'One or more entries contained multiple IDs that are not '

To check the Entry ID of Join type form, it has the combination entry ID of form-A and form-B like '0000aaaa|0000bbbb'. Using the BMC Remedy user Application, I can get the query result.
To see your source , I found some effort to support multiple IDs,

I hope that you could support the multiple IDs query for near future.

Best regards,