Cause

Possibility 1

The source and/or the target at the piping definition point of the piping connection in the P&I diagram have been exchanged.

Possibility 2

The source or the target of the piping connection in the P&I diagram is not assigned to a pre-planning object. The piping connection does not lead anywhere at the source or target end.

Possibility 3

The source or target of the piping connection disposes of a link to a pre-planning object, but it does not belong to the segment that was defined in the piping planning object.

Solution

Regarding option 1

Call up the property dialog of the piping definition and check whether the Exchange source and target check box is activated in the properties. If so, deactivate it.

Regarding options 2 and 3

If a source or target segment is defined for the piping planning object, a pre-planning object that matches this segment has to be assigned to the source or the target in the P&I diagram. Therefore assign a matching pre-planning object to the source or the target.