Problem with update of BLOB field in a table with compound primary key

Hi,
I've been developing an application in Application Express 3.1.2.00.02 that includes processing of BLOB data in one of the tables (ZPRAVA). Unfortunately, I've come across a strange behaviour when I tried to update value in a BLOB field for an existing record via a DML form process. Insert of a new record including the BLOB value is OK (the binary file uploads upon submiting the form without any problems). I haven't changed the DML process in any way. The form update process used to work perfectly before I'd included the BLOB field. Since than, I keep on getting this error when trying to update the BLOB field:
ORA-20505: Error in DML: p_rowid=3, p_alt_rowid=ID, p_rowid2=CZ000001, p_alt_rowid2=PR_ID. ORA-01008: not all variables bound
Unable to process row of table ZPRAVA.
OK
Some time ago, I've already created another application where I used similar form that operated on a BLOB field without problems. The only, but maybe very important, difference between both the cases is that the first sucessfull one is based on a table with a standard one-column primary key whereas the second (problematic one) uses a table with compound (composite) two-column PK (two varchar2 fields: ID, PR_ID).
In both cases, I've followed this tutorial: [http://www.oracle.com/technology/obe/apex/apex31nf/apex31blob.htm]).
Can anybody confirm my suspicion that Automatic Row Processing (DML) can be used for updating BLOB fields within tables with only single-column primary keys?
Thanks in advance.
Zdenek

Is there a chance that the bug will be included in the next patch?No, this fix will be in the next full version, 3.2.
Scott

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