A flow parameter is a mechanism to get user input for the flow. There are some parameters defined already for each flow. The flow parameter allows you to define additional parameters for the Java code to consume. Consider the sample parameter, BusinessUnit, in the sample customization project. BusinessUnit parameter is a custom type parameter which is a much more powerful parameter that requires an implementation class. The BusinessUnitParameterExecutorImpl class (under com.mycompany.primavera.integration.custom.param package) implements the BusinessUnit parameter.
The BusinessUnit parameter is defined in the Customization.xml file as follows:
<FlowDefinitionCustomization>
<FlowDefinitionName>Project Data</FlowDefinitionName>
...
<Parameter>
<DefaultValue/>
<Description>A sample custom type parameter</Description>
<Name>BusinessUnit</Name>
<Sequence>5</Sequence>
<Title>Business Unit</Title>
<Type>Custom</Type>
</Parameter>
</FlowDefinitionCustomization>