Couple problems...

First... remove the "AS" clause from your FROM statements..

From MyTable1 M1, MyTable2 M2 are both implied aliases


Second... SQL Passthrough to either Oracle, SQL or whatever has NO idea of the "?Thisform." parameterizing parts. So... prebuild a local var for these respective values and add into the SQL-Passthrough call where needed.

Now, because of your use of "?" to parameterize in case value not entered, you probably also want to validate that the given values for respective fields exist... If not, fail before even trying the call.

HTH