Description of problem:

When locking a module it is not locked on the version of the installed profile but the latest available one.

See below.

Version-Release number of selected component (if applicable):
dnf-2.7.5-4.fc26.modularity.1.3fb9e5c.git.8052.52e0d41None.noarch


[root@2245f7e719eb /]# dnf module install ModuleA:f26:1/default
Last metadata expiration check: 0:00:27 ago on Mon Oct 23 21:05:28 2017.
Dependencies resolved.
...
...
Complete!

[root@2245f7e719eb /]# dnf module list --installed
Last metadata expiration check: 0:00:41 ago on Mon Oct 23 21:05:28 2017.
modularityABDE
Name                            Stream                         Version                         Profiles                                       
ModuleA                         f26                            1                               client, default [i], ...                       

Hint: [d]efault, [i]nstalled, [l]ocked

[root@2245f7e719eb /]# dnf module lock ModuleA
Last metadata expiration check: 0:01:22 ago on Mon Oct 23 21:05:28 2017.
'ModuleA' is locked (stream: f26, version: 2)
[root@2245f7e719eb /]# dnf module list --installed
Last metadata expiration check: 0:01:26 ago on Mon Oct 23 21:05:28 2017.
modularityABDE
Name                            Stream                         Version                         Profiles                                       
ModuleA                         f26                            2 [l]                           client, default [i], ...                       

Hint: [d]efault, [i]nstalled, [l]ocked