FieldRef variables can be used to set filters on a RecordRef, allowing you to specify the specific data you want to access within the recordset. This can be useful when working with large amounts of data and you only need to access a specific subset of the data.

The two ways to access a record field with a FieldRef variable are RecordRef.Field() and RecordRef.FieldIndex(). RecordRef.Field() requires the Field No. property from the underlying table, while RecordRef.FieldIndex() requires the order in which the field appears in the table.

RecordRef and FieldRef variables are used in AL Language to handle working with records and fields in a table when the specific record or field is not known until runtime. These variables allow you to access and manipulate data in tables without specifying the table or field until runtime.

RecordRef variables are used when you need to work with a record or set of records, but you don't know exactly which table you'll need to access. They can be used in situations where you need to do the same operation with several similar tables, like Sales Header and Sales Invoice Header and Sales Shipment Header, or when you need to do the same operation on a whole bunch of tables that have nothing in common. Therefore, RecordRef variables can be used to access tables with any structure, not just tables with a similar structure, and the statement is false.

It returns a boolean value indicating whether the field is active or not.

The RecordRef.Open() function is used to specify which table to access when working with a RecordRef variable. This function takes three parameters:

• No., which specifies the table number to access;
• Temp, which specifies whether to access a temporary or real table;
• CompanyName, which specifies the company to access.

Only the first parameter is mandatory.