Backup Job cannot append on existing tape and using an overwrite tape instead

Dear all,

Here is the case:

Weekly job A / Weekly job B

Media Set to 1 Week overwrite and infinite append

5 tapes in the pool

Weekly job A set to run with overwrite tape option, as Weekly job B set to run with append option. However Weekly job B never pick up the tapes which job A left, there is still pently of space to use, job B will just pick an overwritable tape to start, did I miss anything? Please advise.

Ed.