1934885 - Error -1001030 Feature, scalar value subquery inside a conditional expression - SAP IQ

A query of this general form produced an error in SAP IQ 15.4 ESD#3, while it worked with no error in IQ 12.7 ESD#10:

select 0
+(select sum (amount) from owner1.table1 where ddate ='20130306' and
column_key not in (3,17,30,130) )
+(select sum (amount) from owner2.table2 where ddate ='20130306' and
column_key not in (3,17,30,130))
...

+ISNULL ((select sum (amount) from  owner1.table3 where
ddate='20130306' and column_key not in (3,17,30,130)),0)
+ISNULL ((select sum (amount) from  owner2.table4 where
ddate='20130306' and column_key not in (3,17,30,130)),0)
...

Msg 21, Level 14, State 0

SQL Anywhere Error -1001030: Feature, scalar value subquery (at line 9) inside a
conditional expression (CASE, COALESCE, ARGN, NULLIF, or IF), is not
supported.
-- (opt_Select.cxx 2241)

• SAP IQ 15.4 ESD#3
• Red Hat Enterprise Linux 5.8 64-bit
• 64-bit Intel Westmere machines with dual six-core CPUs with Hyper-Threading Technology

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