Check if you can use an existing child base object.

Do not add a root base object to store the person or organization information.

Do not define tables with names greater than 24 characters.

Do not delete existing base objects.

Do not delete existing columns.

Do not modify the physical names of existing base objects. However, you can modify the display names.

Do not modify the data type of an existing column.

Do not decrease the length of an existing column.

Prefix the names of the new base object tables to distinguish the tables from the existing tables. The prefix indicates the type of table. Use the following naming convention when you create a base object:

Prefix	Table
C_XO_	Root or child record base object.
C_XR_	Relationship base object.
C_XT_	Lookup base object.

If you add a column to an existing table, prefix the name of a column with

X_

.