CDS View: How to define JOIN in hdbdd file?

Question

Maybe I missed something, but how can I define JOINs for a CDS view in a hdbdd file?
I have the following 2 tables and a view. The view claims that there is a syntax error on "left".
I found no examples on how to JOIN in the documentation (only for ABAP).
@Catalog.tableType : #COLUMN  
entity Project {
key ID      : Integer64 not null;
Name        : hana.VARCHAR(64) not null;
Description : hana.VARCHAR(256);
@Catalog.tableType : #COLUMN  
entity Scenario {
key ID      : Integer64 not null;
Name        : hana.VARCHAR(256) not null;
Description : hana.VARCHAR(256);
ProjectID   : Integer64 not null;
view MData as select from Project left join Scenario on Scenario.ProjectID = Project.ID {
  Project.Name as Project,
  Scenario.Name as Scenario

Answer 1

OK, I made some progress, but now I have the following problem:
[1310081] No association with cardinality > 1 allowed in WHERE Clause
  @Catalog.tableType : #COLUMN   
  entity Project {
    key ID      : Integer64 not null;
    Name        : hana.VARCHAR(64) not null;
    Description : hana.VARCHAR(256);
    Scenarios   : association[*] to Scenario on Scenarios.ProjectID = ID;
  @Catalog.tableType : #COLUMN   
  entity Scenario {
    key ID      : Integer64 not null; 
    Name        : hana.VARCHAR(256) not null;
    Description : hana.VARCHAR(256);
    ProjectID   : Integer64 not null;
    Variants    : association[*] to Variant on Variants.ScenarioID = ID;
  @Catalog.tableType : #COLUMN   
  entity Variant {
    key ID      : Integer64 not null;
    Name        : hana.VARCHAR(64); 
    Description : hana.VARCHAR(256);
    ScenarioID  : Integer64 not null;
    TestTypes   : association[*] to TestType on TestTypes.VariantID = ID;
  @Catalog.tableType : #COLUMN   
  entity TestType {
    key ID      : Integer64 not null;
    Name        : hana.VARCHAR(64) not null; 
    Description : hana.VARCHAR(256);
    VariantID   : Integer64 not null;
  view MData as select from Project {
    Project.Name as Project,
    Scenarios.Name as Scenario,
    Scenarios.Variants.Name as Variant
  } where Scenarios.Variants.TestTypes.Name = 'SUT';