csv export "not very accurate"

[aliponte]

FET exported csv files. A warning appeared.
"There are subactivities which were modified separately. The export was done, but it is not very accurate." What does it exactly mean?
I had a look at the file's content and didn't find an inaccuracy.

[Volker Dirr]

example:
Math in group 5a is teached 4 hours per week. max 1 hour per day with min n day 100%. teacher is Mr.A.

so csv export is:
"5a","Math","Mr A","",4,1,100,0

now 1 of these hours should be a team teaching activity with Mrs. B. So you modify a subactivity and include also Mrs. B.
Check the csv export again. csv is not correct now.

if you add Mrs. B into first subactivity, then it is:
"5a","Math","Mr A+Mrs B","",4,1,100,0
so all activities are team teaching activities.

if you add Mrs. B into second, third or fourth subactivity, then it is:
"5a","Math","Mr A","",4,1,100,0
so the teamteaching activity is not exported.

similar to changed subject, students set and activity tags.