PM6 Calculating Multi-projects total float problem

I have a similar problem. I have activities in 2 projects linked. Succeeding activity (simple FS relationship) shows correct total float between early & late but preceeding activity does not show this float. Preceeding activity does not have any constraints and I cannot work out why it does not have same float as successor. Any advice from anyone?

Help!

2 projects same completion dates? Any constraint dates?

Cheers,

actually, one project is for procurement,and the other project is all milestones with constraints date from construction contractor for equipment on-site date.

no one knows?

Did you check your Scheduling options for "Calculate float based on end date of:"? Try with "opened projects" selected.

The following is out of Primavera Help:
"Calculate float based on end date of: Choose the method by which to calculate the float period:

Choose Each project: schedules external relationships on the backward pass using each project’s finish date for open-ended activities, including activities that have an external relationship.

Choose Opened projects: schedules external relationships on the backward pass using the latest finish date of all opened projects and external relationship dates to calculate late dates of activities. Float for open-ended activities is calculated using the latest finish date of all opened projects, allowing for more float than the Each project option. Each Project’s Scheduled Finish date field is calculated as the latest finish date of all opened projects."

Hope this helps
Dieter

They may be using different calendars, if the calendar is different, float will be different.
Another option is that the overall completion date of project 1 is different than the overall completion date of project 2, howvere, I still think the calendars are different.
Check these possibilities and let us know, so we can keep looking for options,

cheers

to Dieter,
thanks for your reply.
I can not find the options you mentioned, where they are?

to Diego,

thanks for your reply
the two projects are using the same calender, i also thought this problem may caused by calender. so i copied project1 as project 2 and did the test.

Zhang Haixiang

It’s among the Scheduling Options:
"F9" --> choose "Options" --> The third option/parameter if you’ll count from the bottom.

Regards
Dieter

to Rashid Iqbal,

that’s exactly what i did.

to Dieter,

after F9--> Options

there are 2 tabs - general and advanced

on the General tab, the last 3 options are:
1 Define critical activities as
* total float less than or equal to __
* longest path

2 Compute total float as
finish float = late finish - early finish

3 Calendar for scheduling relationship lag
predecessor activity calender

------------------------------------------------
I can no find the option you mentioned, are we using the same software?

I’m using Primavera Project Management release 6.1 (Build #:00001210)

Sorry I assumed that you work with the current version.

This setting is in 6.2

But as Oracle announced a while ago, they won’t support 6.1 any longer, it’s better to upgrade.

Regards
Dieter

Hi Dieter,

You said Oracle won’t support 6.1 any longer but what I know in Hong Kong we’re using 6.0. Indeed we’re doing tender for projects were it is specifically required to use 6.0.

Cheers,
Nestor

Nestor

That’s what I’ve heard from Primavera. There won’t be a bug-fix for 6.1.

Our transfers from 6.0 to 6.1 then to 6.2 where without any problems. An update of the database is required.

Regards

Dieter

thanks Dieter

Zhang Haixiang

You’re welcome.

I just remember that I had this issue some time ago. Data date seemed the same but due to some reason the time was different. Change of the data date either by "Fill Down" in the project’s view or by "Apply Actuals". It must be exactly the same date and time and you need one common start and one common finish for all projects.

Good luck!
Dieter

Thanks Dieter, I’ll check

For those still using P 6.0.

- Are you facing any problem?
- What are the problem or issue and how to rectify?

I have float calculation error when using P 6.0. When i originally developed the program it showed no negative float (it showed 0 day float)

I have export and import the same program into same database, it showed my project delayed for 2 months.

- I have checked the originally file, scheduling (F9) so many times, it still showed 0 day total float. But when export and import back into same database or different database it will showed negative 2 months total float (delay for 2 months)

I will try to answer Haixiang’s question.

If you set your Schedule B’s Project Must Finish By Date to December 2999, the negative float should be gone.

I try to guess why it happens:
If you leave Project Must Finish By Date blank, P6 will use Datadate+Total Project Duration as the Project Finish date to back path calculate the Late Finish Date for each activity. Therefore, the Late Finish for activity2 is not driven by activity 1 since they belong to different project.

Please try and let me know.
Feng