In SAP CPQ, custom validity conditions for attributes are frequently implemented to ensure user input conforms to a specific format. The primary syntax used for this type of pattern-matching validation is the regular expression. Administrators can enter a regular expression directly into the "Validation/Error Message" field within an attribute's configuration. If the user's input does not match the defined regular expression pattern, a specified error message is displayed, enforcing data integrity for fields like postal codes, phone numbers, or email addresses.

A. Python: While IronPython is the scripting language for complex business logic and rules in SAP CPQ, including advanced validation, regular expression is the specific syntax for the dedicated attribute-level input validation feature.

B. Scheme: Scheme is a Lisp dialect and is not a supported language or syntax for configuration or scripting within the SAP CPQ environment.

D. XML: XML (eXtensible Markup Language) is used for data structuring and transport, not for defining executable logic such as a validity condition.

1. SAP Help Portal - SAP CPQ Documentation: In the section on Product Catalog management

the configuration of attributes is detailed. For text-based attributes

the documentation specifies the use of the "Validation/Error Message" field. It states

"You can enter a regular expression to validate the user's input. If the input doesn't match the regular expression

the error message is displayed."

Source: SAP Help Portal

SAP CPQ

"Product Catalog"

section "The Attributes Tab".

2. SAP Help Portal - SAP CPQ Scripting Guide: While the guide details the use of IronPython for complex rules

it distinguishes this from simple attribute validation. Validation rules written in Python are typically used for more complex scenarios involving multiple attributes or calculations

whereas direct input format validation on a single attribute uses regular expressions.

Source: SAP Help Portal

SAP CPQ

"Rules and Formulas"

section "Validation Rules".