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Pinned topic mechanism of Synchronous invoking

‏2009-04-02T15:48:00Z |
We have a BP 'Parent' which invokes a BP 'Child' Synchronously. The BP Child should notify BP 'Parent' after it gets completed but The BP Child is going to halted state, error shows \u201Cprev wfc not available\u201D. As we have two nodes, initially I thought that it may be happening because of the two BP runs in two different nodes. So I specified a single node for both of them but it still going to halted state. does any of you faced this kind of situation. \n\nCan you please describe the mechanism of Synchronous invoking. \n\n\nRegards\nMalay