Error ORA-01790: for INSERT in master detail form

Gidday;
I get the error message 'ORA-01790: expression must have same datatype as corresponding expression' when I attempt an insert operation in the detail region of a master/detail form.
I have checked previous entries of this error I could find - as far as I can tell the parent key defaults are correct.
It seems one of the factors could be that the tables are not within the 'home' schema for the application. I have created a similar default master detail form on the tables, with the home schema matching that for the tables. Within my major application I have ensured the correct schema is referenced in all fields (all those I could find - in the Report Attributes / Column Attributes area).
I just cannot find which expressions are mis-matching their datatypes.
thanks; DS

Hi,
According to [http://ora-01790.ora-code.com] the error is raised because "A SELECT list item corresponds to a SELECT list item with a different datatype in another query of the same set expression." Do you have any Select Lists on your page? If you do, is the "return value" of the same datatype as for the underlying field?
One thing to try in these circumstances is to click the Debug link on the Developer's toolbar at the bottom of the page and then try to insert your record. You will get a whole stream of messages appear on the left of the page and the error should become obvious.
You could also check that all the defaults you have set do not contain spaces or linefeeds at the end - I have seen this cause issues before.
Andy

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