CONVT_NO_NUMBER - Runtime error

Hello Experts,

I am modifying an SAP standard script in which I called a subroutine pool program.

To the program, I am passing an amount value to perform some calculations. When I try to execute the form, I got a runtime error saying as below.

Runtime Errors         CONVT_NO_NUMBER

Unable to interpret " 249,900.00-" as a number.

The value passed is from the table RF140-WRSHB.

Any inputs on how to resolve this issue will be highly appreciated.

Thanks.

Sandy