Today I got weird error to solve, which shows error message Unable to compile "100,00+12,00".
While opening TAX form from Purchase line this error occurred as below.
Actually, the culprit was function evalbuf, which is part of AX framework.
This function evaluates formula string. The limitation of this function is that we must use "." as decimal separator in formula string.
In our case the decimal separator was "," so evalbuf was throwing error "unable to compile" with expression passed as shown in above image.
To solve error, I have used strReplace function from global class which replaces "," to "." in the formula string.