Meaning: The flow directions are inconsistent. You need to edit one of the flow directions to match the other flow direction.
Recovery:
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Open the Piping task.
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Click Select .
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Set the Locate Filter to Piping Runs.
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Select the pipe and note the flow direction.
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Select the other pipe and note the flow direction.
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After determining which flow direction needs to be corrected, select that pipe run.
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Click on one of the flow direction arrows.
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In the Flow ribbon that appears, select the correct flow direction.