Problem with basic "subtract" function

Hi Experts,

I have a strange error in mapping while using subtract function.

Field_A (20071001) - Constant (19000000) = Result (1071000)

The Result should be 1071001.

Check the screenshot of mapping.

http://docs.google.com/Doc?id=ddmc8m97_8gxczcgdt

Note:

--> I have tried the field as Integer, Float and String also, but same result.

--> It is not working for add function also, like

Field_A (20071001) + Constant (-19000000) = Result (1071000)

--> It is working fine for other values.

Please help me in this.

Regards,

Naveen Chamala