passing field with no value in the criteria selection in sap b1 to crystal reports

I made a custom report in crystal reports that runs a filter with some parameters and an SQL command and it works just fine but when I linked it to sap b1 and tried to pass some empty parameters it says that the fields are obligatory even though it works fine in sap crystal reports

I want to know if it's possible to pass an empty value or is there another method to do it.