### **Environment**:

OpenProject dev branch as of 2022-02-12

### **Logs**

```bash
$ OPENAPI_GEN_VERSION=5.3.1
$ [ -f "$DATA_DIR"/openapi-generator-cli-"$OPENAPI_GEN_VERSION".jar ] || wget https://repo1.maven.org/maven2/org/openapitools/openapi-generator-cli/"$OPENAPI_GEN_VERSION"/openapi-generator-cli-"$OPENAPI_GEN_VERSION".jar
$ java -jar "$DATA_DIR"/openapi-generator-cli-"$OPENAPI_GEN_VERSION".jar generate --generator-name java -i openapi-spec-bundle.yml (...snipped args...) 2>&1 | egrep WARN | sort | uniq -c
Begin of the insertion    6End of the insertion Begin of the deletion     6End of the deletion [main] WARN o.o.codegen.DefaultCodegen - allOf with multiple schemas defined. Using only the first one: File_LinkModel
   28 [main] WARN o.o.codegen.DefaultCodegen - allOf with multiple schemas defined. Using only the first one: Formattable
  592 [main] WARN o.o.codegen.DefaultCodegen - allOf with multiple schemas defined. Using only the first one: Link
$
```

### Begin of the insertion

End of the insertion Begin of the deletion
End of the deletion **Steps to reproduce:**

1. Run OpenAPI Generator against OpenProject dev branch API spec YML files Begin of the insertion


End of the insertion Begin of the deletion

End of the deletion ### Begin of the insertion**ExpectedEnd of the insertion Begin of the deletion **ActualEnd of the deletion Behavior**

No warnings are output.

### Begin of the insertion**ActualEnd of the insertion Begin of the deletion **ExpectedEnd of the deletion Behavior**

Hundrets of warnings are output, but only a specific type: `allOf with multiple schemas defined. Using only the first one`

Or is this fine in the spec ans a limitation in the OpenAPI Generator? (Unfortunately, I'm no OpenAPI expert yet.)