The question about the 'force-bump' and the 'force-no-bump'

Hi all

I think about the backup schedules as follow:

1st　full backup(LV0)
2nd　partial backup(LV1)
3rd　partial backup(LV1)
4th partial backup(LV1)

'force', 'forcd-bump', and 'forcd-no-bump' each option of the amadmin command had been executed specifying it before the
amdump command was executed.

1st
$ amadmin DailySet_HD force rh5cli /var/test
$ amdump DailySet_HD

2nd
$ amadmin DailySet_HD force-bump rh5cli /var/test
$ amdump DailySet_HD

3rd
$ amadmin DailySet_HD force-no-bump rh5cli /var/test
$ amdump DailySet_HD

4th
$ amadmin DailySet_HD force-no-bump rh5cli /var/test
$ amdump DailySet_HD

When the dumpcycle was '1 week' , the backup level was as follows:
1st　full backup(LV0)
2nd　partial backup(LV1)
3rd　partial backup(LV1)
4th partial backup(LV1)

But the dumpcycle was '0', the backup level was as follow:
1st　full backup(LV0)
2nd　partial backup(LV1)
3rd　full backup(LV0)
4th full backup(LV0)

In this case, is it a specification of amanda that the full backup is executed because dumpcycle is 0 even if option 'force-no-bump' is executed?

Your prompt reply would be greatly appreciated.

Thanks in advance.