In a Microsoft BizTalk Server 2004 orchestration, you cannot use a Call Orchestration shape or a Start Orchestration shape to pass a derived type that has the base type as the parameter to an orchestration.

When you double-click either a Call Orchestration shape or a Start Orchestration shape, the Variables in Scope list only contains variables of the base type. Therefore, you cannot choose derived typed variables.

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This issue is a known limitation of the Call Orchestration shape and the Start Orchestration shape.

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To resolve this issue, use the Expression shape instead of a Call Orchestration shape or a Start Orchestration shape.

For a replacement for the Call Orchestration shape, use an expression that is similar to the following:

 call OrchestrationNamespace.OrchestrationName(derivedtype);

For a replacement for the Start Orchestration shape, use an expression that is similar to the following:

 exec OrchestrationNamespace.OrchestrationName(derivedtype);

Note In both expressions, derivedtype is a variable that uses the derived type instead of the base type.

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For more information, visit the following Microsoft Developer Network (MSDN) Web sites:

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