Hi, sorry for english, I'm brazilian and I'm using Google Translate.
I started doing some tests with SMB and LDAP on OMV during the past week and had some similar problems. The service did not start and gave some errors when trying to register the server SMB in openLDAP.
I was able to resolve this only after importing the Samba schema into the LDAP base. Here are the links to the tutorials that helped me with this:
https://help.ubuntu.com/lts/serverguide/samba-ldap.html.en
https://help.ubuntu.com/lts/se…en#openldap-configuration
I hope you can help, see you later!