'dependencies.dependency.version' for xxx is missing #104

[ERROR] The build could not read 1 project -> [Help 1]
[ERROR]   
[ERROR]   The project xxx:2.0.0-SNAPSHOT (/home/xxx/pom.xml) has 8 errors
[ERROR]     'dependencies.dependency.version' for javax.servlet:javax.servlet-api:jar is missing. @ line 131, column 21
[ERROR]     'dependencies.dependency.version' for org.springframework.security:spring-security-core:jar is missing. @ line 138, column 21
[ERROR]     'dependencies.dependency.version' for org.springframework.boot:spring-boot-starter-data-jpa:jar is missing. @ line 144, column 21
All of these are declared as <dependency> in the project's pom, without specifying a version. The version is supposed to come from Spring Boot's <dependencyManagement> section, which is normally brought in from their parent.




    

I have moved the <dependencyManagement> into a tile, and this tile is properly brought in in the <tiles> section. (I know this is listed as a smell in the tiles documentation, but this is how Spring Boot does things - I don't have much of a choice)
Few questions:
any obvious reason why I am not getting the <dependencyManagement> into my pom?
I assume tiles runs before the first Maven validate lifecycle phase - is this correct?
is there any way to see the pom after it has been "processed" by tiles to inspect how it looks before it gets passed to the Maven validate lifecycle phase?
There doesn't seem to be much documentation how tiles actually integrates into Maven (when in the lifecycle tiles does it's thing, how to inspect the output pom that tiles generates before it goes to Maven etc.)
Any inside is appreciated, thanks!