Invalid Relationship

Moutaz,
Is this schedule import from other software (i.e. MS Project)? Check the predecessor and successor, it maybe link to WBS summary activity.

Dear Rodel,

It is not imported from other software, but the open end activities are too much.

Regards,

Moutaz

Moustaz,
The best way to trace the error is by running Check Project Integrity.

Select Tools-> Check Project Integrity
Tick Automatically fix correctable errors and tick Log to file
Click … buttons and enter destination directory and filename (default: CHKDATA.TXT)
Click Check and when finished click View Log. It will show all the error found on your schedule and you can easily trace & fix the cause.

Dear Moutaz

maybe there is a loop (cycle) in project network. consider 4 activities with following relations:
-------------------------
predecessor----->activity
-------------------------
e--------------->b
b--------------->c
c--------------->d
d-------------->e

if so,it’s likey to get an error message. i don’t know if PM alows entering such relations or not, but "check integrity" and make sure there’s no cycle.

Regard,
Abed