• You set the Rules-based ATP allowed indicator in the check instructions in APO.
• If the OLTP system is an R/3 system, you maintained a business transaction and assigned it to an order type. In the R/3 System choose Customizing for Sales and Distribution via Basic Functions ® Availability Check and Transfer of Requirements ® Availability Check ® Rules-Based Availability Check ® Define business transaction and Assign business transaction to sales order type.

1. You define different key combinations (fields that you have chosen) from the field catalog and assign them to database tables, so-called condition tables.
2. The rule strategy is used to find condition tables. The rule strategy can contain several condition types. In most cases, you should not use more than one condition type.
3. You assign an access sequence to each condition type. The access sequence specifies which condition tables are relevant for a specific condition type. An individual step within this access sequence corresponds to the access to a condition table. Based on the fields defined in the table (key combinations), the system can find the valid condition records.
4. When you create the rule determination, you save comparison values, which are used to determine a rule based on the condition type and condition, for the relevant fields.
5. The rule can contain several procedures: the product substitution procedure, location determination procedure - or alternatively, a location product substitution procedure, PPM substitution procedure, rule control and calculation profile.

Maintaining Check Instructions

Maintaining Field Catalogs

Creating Condition Tables

Changing Condition Tables

Creating Condition Types

Creating Access Sequences

Maintaining Rule Strategies

Assigning Rule Strategies

Integrated Rule Maintenance

Creating Rule Determinations