Why subqueries in case are not working in teradata? - response (5) by AshishPatil

Hi Dieter,
I am also facing the same issue, for converting one oracle query to Teradata.
Oracle Query:
case when W_PARTY_PER_D.X_DISTRICT in (select upper(WC_ORG_EXT_XM_F.attrib_04) from wc_org_ext_xm_f where pf_org_wid = a.PR_VIS_ORG_WID)  then 0 else 1 end 
Here "a" is representing entire subquery alias which is treated as table here to join with other tables.
Please help to replicate same in Teradata.
 
Regards,
Ashish