Relationship SRMDOCP04 with SCMG_T_CASE_ATTR

I am using the SCASE transaction for the control of cases, and I have a Z report to show the detail of them; but users want to add a column with the name of the document of response of the case. The problem is that the table where the case is the srmdocp04 and I need to link it with the table of the SCMG_T_CASE_ATTR cases.

Is there any bapi, function or class that can be used?

I could help?

thanks,

Adriana