Deployed a simple Roxie query that has a STORED request parameter of type DECIMAL5_2 as follows:

export test11() := FUNCTION
DECIMAL5_2 inSalvageValue := 0.0 : STORED('SalvageValue');
OUTPUT(inSalvageValue);
RETURN TRUE;
END;

For some inputs, it causes an exception:

./testsocket.exe 10.194.205.7:9876 "<klogemann.test11><salvagevalue>1.15</salvagevalue><submit_type>run_xslt</submit_type></klogemann.test11>"
<Exception>
<Source>Roxie</Source><Code>3000</Code><Message>assert(m.length() == tlen) failed - file: ccdcontext.cpp, line 1913</Message></Exception>

For other inputs, it doesn't get an exception, but doesn't produce the proper value:

./testsocket.exe 10.194.205.7:9876 "<klogemann.test11><salvagevalue>1.5</salvagevalue><submit_type>run_xslt</submit_type></klogemann.test11>"
<Dataset name='Result 1'>
<Row><Result_1>####</Result_1></Row>
</Dataset>
<Dataset name='Result 2'>
<Row><Result_2>true</Result_2></Row>
</Dataset>

@Anthony Fishbeck