Is it supported to run SQL Backup script follow by Transaction Log backup script under a single policy?

I have 2 backup policy as follows:

1) SQL Backup Policy

2) Transaction Log Backup Policy

I have tested by adding the transaction log script into the first policy and the backup was successful.

From my observation, the Database backup will complete first follow by the transaction log. However, my consultant mentioned that this is not a supported setup and it is advisable to split the Database and Transaction log backup into 2 policy. Have anyone perform similar configuration in their environment before and encountered any issue?