C1 Contract Rules for Providing Elementary Data Types

Elementary data types can be released as follows:

In ABAP Dictionary and ABAP CDS based on DDIC built-in data types
- Standalone as DDIC domains or data elements
- Component types of DDIC structures or database tables
- Element types of CDS entities
In ABAP language based on built-in ABAP types
- Public types of global classes or interfaces
- Types of interface parameters of methods, events and function modules

A provider of an elementary type must obey the following rules:

The built-in data type must not be changed with the following exceptions:
- DDIC built-in data types INT1, INT2, and INT4
- built-in ABAP types b, s, and i
Those may be replaced by an integer type with a larger value range.
The length must not be changed with the following exceptions:
- DDIC built-in data types CHAR, SSTRING, DEC, CURR, QUAN, DF16_DEC and DF34_DEC
- Built-in ABAP types c and p
The length must not be decreased.
The number of decimal places must not be changed with the following exceptions:
- DDIC built-in data types DEC, CURR, QUAN, DF16_DEC and DF34_DEC
- Built-in ABAP type p
The number of decimal places must not be decreased.