Difference of member and shooter fields in spreadsheet to import in ps

Hi all, can anybody please explain the difference between the fields member and shooter when using the prepared spreadsheet format to import a series of shooters into the Practiscore app. In Germany we have an IPSC License Number. Do you think it should go into to the member field or into the shooter field? Finally I want to use the Android export function to get the final match data into WinMss and ideally the German IPSC License Number shall be in the right field then. Thanks for this great tool !!! And thanks for your kind help. Best regards, Christian