Using supported data types for a custom data item

The following data types are available when defining a custom data item:

String: Allows up to 1000 characters.
Memo: Allows up to 1000 characters.
Number: Allows only numbers and rejects non-numerical entries.
Integer number: Allows only integer values.
Money: Allows a specific currency and currency symbol.
Date: Allows only a date.
Percent: Allows only a percent.
Boolean: Allows only one of two options.
Document: Allows uploading files.
Lookup: This type has a defined list of values and the fields belonging to this data item are read only.