Defining formula expressions
- Select BPA Designer > Operations > Expressions.
 - 
				In the Document
					field, select the input business document for which to define an
					expression.
				For accounting framework integration, the list shows transactional document registrations. For a flexible output integration, both the master data and transactional document registrations are displayed.
 - Click Add.
 - 
				Specify this information:
				
- Name
 - Specify a unique name that identifies the expression. Valid characters are a–z, A–Z, and 0–9. The first character should be an uppercase letter. The maximum length is 20 characters.
 - Type
 - Select Formula.Note: A Statement field is displayed containing these controls:
- Operand Types - possible values are Attribute, Expressions and Fixed Value.
 - Operators
 - Statement Control buttons - use these buttons to navigate and perform editing functions on the statement.
 
 
 - 
				Select the operand type. The displayed fields depend on the
					selected operand type.
				For Attribute argument:
- Mapping
 - Select the document registration. This list is dynamic. For accounting framework integration, the list displays transactional document registrations. For a flexible output integration, both the master data and transactional document registrations are shown.
 - Attribute
 - Select the attribute. This list is dynamic. It displays the attributes with number data type associated to the selected document registration.
 
For Expression argument:- Name
 - Select the expression. This list is dynamic. It displays existing formula, search template, and REST API expressions associated to the selected document. For search template expressions, only expressions returning a single result are displayed.
 
For argument of type Fixed Value:- Value
 - Specify a fixed numeric value.
 
 - Click Add.
 - 
				Before adding another operand, select an operator to specify an
					arithmetic operation.
				Note: Use parenthesis to group operands and operators, and to specify the order of computation.
 - Click Save.