Problem:

The following is displayed when using AutoPIPE

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Warning
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W21-21: Cannot perform this operation, multiple points selected.
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OK
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Why and How to avoid it?

Solution:

 This may have occurred when one or more node points were selected in the model and trying to press the Home > Operations > Segments > Join Segment(s)

Example: 

Trying to connect A02 to B00, by selecting the node points and pressing the Segment Join command. 

There are a number of rules associated with using the Segment Split / Join operations, suggest to review AutoPIPE help for details on them all. 

Avoidance

First and foremost, this operation can only be performed at a RUN node point that was shared by only 2 segments. Follow any other rules mentioned in AutoPIPE help. 

In the example above. 

Step #1:

Select first node point on Segment B (ex. B00)

Step #2: 

Insert Run from front of valve face  (B00) to last node point of previous segment, A02

Step #3:

Use Segment Join command to join both segments. 

Done!!

See Also

"Warnings" Messages

Bentley AutoPIPE