Hello. I have a question regarding Error 3201 (You cannot add or change a record because a related record is required in table <name>). It is my understanding that this error occures when the referential integrety rules are violated. In my case this error pops up every time I leave a table fieled, that links this (many) table to a one table (that's a foreign key, right? ), empty. I want to know if there is a way I can make this work? Keep my referential integrety and still have the option to leave my fieled blank? I am sorry if my question is dumb; I'm a little new at this.