Dynamic SQL from within DML - merging syntax issue #2

Further to my previous thread on a SQL - DML merging syntax issue, I have another problem with multiple conditions in the WHERE-clause:
vrb _retval decimal
vrb _val1 text
vrb _val2 text
_val1 = 'value1'
_val2 = 'value2'
SQL SELECT DIM1_ATTR1 FROM MYSCHEMA.DIM1_DIM WHERE COL1 = :_val1, AND COL2 = :_val2, INTO :_retval
The above SQL will return NA. If I use the text literals instead of the OLAP variables, the query just runs fine. Also, with a single condition (on COL1 only) the query returns the expected value.
A note in the help states that OLAP DML objects should clearly be sperated from the rest of the SQL but does not say how. I am using a colon before and a comma after as without them the line would not compile. I could not find any example that would use multiple conditions in the WHERE-clause however the help text indicates that it is possible.
Please help me, how.
Regards,
Csaba
Windows, Oracle10gRel2 Ver. 10.2.0.1.0 eversion: 84090

It does work, although I applied the finishing touch by removing the commas as well!
Thanks a lot! Good job!
Could you please have a look at issue #1 too? :-)
Regards,
Csaba

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    CORE     10.2.0.3.0     Production                                     
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