When an activity is deleted then a chain of logical activities is broken. The Edit, Dissolve command and the right-click Dissolve command will delete an activity and links the predecessors and successors with a Finish-to-Start relationship. A Dissolved activity may not be undone.
P6 Version 19 introduced the ability to retain lag when dissolving activities. When Retain Lag is selected from the User Preferences, Calculations tab, the dissolved activities predecessor and successor lags will be added together to calculate the lag in the new relationship.
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When Oracle Primavera P6 introduces new functions then they are often turned off by default so the software calculates the same as earlier versions and this option is unchecked by default in the User Preferences, as per the picture below, and the user must check the option before it operates:
- Before Dissolving Activity 2:
- After Dissolving Activity 2 in P6 Version 19 without Retain Lag checked or in earlier versions of P6:
- After Dissolving Activity 2 in P6 Version 19 with Retain Lag checked:
NOTE: The predecessor and successor lag are added together.
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Paul E Harris
Director Eastwood Harris Pty Ltd
6 June 2024