SAP Message 5C509 - Format for fixed number of decimal places is incorrect.

Diagnosis
The entered decimal number does not correspond to the expected systemformat.

Procedure
Enter the decimal number in the form '999.999,99', '-999.999,99' or'999.999,99', if you have chosen "comma" as decimal place in your userparameters. Otherwise "," and "." are swapped over. The thousanddecimal hyphen can be left out.
If you have changed the corresponding settings for the current terminalsession in the user parameters, please register yourself again.
Otherwise four decimal places can be entered.