RSEM bam question

[RikyJKD]

Hi, I used RSEM with STAR. I noticed that in the RNAME field of the BAM (3rd filed) , where usually had e.g chr1 now I have the name of the isoform. With this BAM I can not find the chr but I need this information.
Is it normal to have this kind of BAM?
How can I solve this problem?
Thank you.

[dpryan]

RSEM needs alignments against the transcriptome, so it'd be a big problem if you had chromosomal coordinates. So this is expected (required even), it's not a problem.

[RikyJKD]

Thank you.