Unable to insert record in table in base application

edit

Hello,

You do not state the database you are using (Base is not a database).

Usual explanation for this type of problem is that there is no field assigned as a Primary Key in the table. This is essential in an RDBMS (Relational Database Management System). Edit the table and assign (or insert new field for) a field as the primary key field.

Further information in documentation -> LibreOffice Base Guide in Chapter #3 -Tables.