diff --git a/CHANGELOG.md b/CHANGELOG.md
index 97da7fbc..3b998343 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,6 +9,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Added
 - sourcerpm attribute for Rpm unit
+- Introduced 'population_sources' and 'ubi_population' attributes for yum repository
 
 ## [2.5.0] - 2020-02-25
 
diff --git a/pubtools/pulplib/_impl/model/repository/yum.py b/pubtools/pulplib/_impl/model/repository/yum.py
index 6c9e97da..7b17ec8d 100644
--- a/pubtools/pulplib/_impl/model/repository/yum.py
+++ b/pubtools/pulplib/_impl/model/repository/yum.py
@@ -70,6 +70,21 @@ class YumRepository(Repository):
 
     type = pulp_attrib(default="rpm-repo", type=str, pulp_field="notes._repo-type")
 
+    population_sources = pulp_attrib(
+        default=attr.Factory(FrozenList),
+        type=list,
+        converter=FrozenList,
+        pulp_field="notes.population_sources",
+    )
+    """List of repository IDs used to populate this repository
+    """
+
+    ubi_population = pulp_attrib(
+        default=False, type=bool, pulp_field="notes.ubi_population"
+    )
+    """Flag indicating whether repo should be populated from population_sources for the purposes of UBI
+    """
+
     mutable_urls = attr.ib(
         default=attr.Factory(lambda: FrozenList(["repodata/repomd.xml"])),
         type=list,
diff --git a/pubtools/pulplib/_impl/schema/repository.yaml b/pubtools/pulplib/_impl/schema/repository.yaml
index affaecbe..f0976cd4 100644
--- a/pubtools/pulplib/_impl/schema/repository.yaml
+++ b/pubtools/pulplib/_impl/schema/repository.yaml
@@ -83,6 +83,17 @@ properties:
       pub_temp_repo:
         type: boolean
 
+      # True if repository supposed to be populated from repositories
+      # mentioned in population_sources
+      ubi_population:
+        type: boolean
+
+      # List of repositories used for populating the repository
+      population_sources:
+        type: array
+        items:
+          type: string
+
   # List of repository distributors.
   # Note that order matters in this list.
   distributors:
diff --git a/pubtools/pulplib/_impl/schema/unit.yaml b/pubtools/pulplib/_impl/schema/unit.yaml
index 56ec14cd..42f691b6 100644
--- a/pubtools/pulplib/_impl/schema/unit.yaml
+++ b/pubtools/pulplib/_impl/schema/unit.yaml
@@ -61,7 +61,9 @@ definitions:
 
       # source rpm filename
       sourcerpm:
-        type: string
+        anyOf:
+        - type: string
+        - type: "null"
 
       # Short ID of key used to sign this RPM
       signing_key:
diff --git a/tests/fake/test_fake_search_content.py b/tests/fake/test_fake_search_content.py
index 7d797444..d41003e2 100644
--- a/tests/fake/test_fake_search_content.py
+++ b/tests/fake/test_fake_search_content.py
@@ -22,7 +22,13 @@ def populated_repo(controller):
         RpmUnit(
             content_type_id="srpm", name="bash", version="4.0", release="1", arch="src"
         ),
-        RpmUnit(name="glibc", version="5.0", release="1", arch="x86_64"),
+        RpmUnit(
+            name="glibc",
+            version="5.0",
+            release="1",
+            arch="x86_64",
+            sourcerpm="glibc-5.0-1.el5_11.1.src.rpm",
+        ),
         ModulemdUnit(
             name="module1", stream="s1", version=1234, context="a1b2", arch="x86_64"
         ),
@@ -91,7 +97,13 @@ def test_search_content_by_type(populated_repo):
     units = list(populated_repo.search_content(crit))
     assert sorted(units) == [
         RpmUnit(name="bash", version="4.0", release="1", arch="x86_64"),
-        RpmUnit(name="glibc", version="5.0", release="1", arch="x86_64"),
+        RpmUnit(
+            name="glibc",
+            version="5.0",
+            release="1",
+            arch="x86_64",
+            sourcerpm="glibc-5.0-1.el5_11.1.src.rpm",
+        ),
     ]
 
 
diff --git a/tests/repository/test_yum_repository.py b/tests/repository/test_yum_repository.py
index 822ec761..8ba46a5d 100644
--- a/tests/repository/test_yum_repository.py
+++ b/tests/repository/test_yum_repository.py
@@ -54,5 +54,21 @@ def test_from_data_skip_rsync_repodata():
             ],
         }
     )
-
     assert repo.skip_rsync_repodata
+
+
+def test_populate_attrs():
+    """test populate attributes are correctly parsed from repo notes"""
+    repo = Repository.from_data(
+        {
+            "id": "my-repo",
+            "notes": {
+                "_repo-type": "rpm-repo",
+                "population_sources": ["populate_repo1", "populate_repo2"],
+                "ubi_population": True,
+            },
+            "distributors": [],
+        }
+    )
+    assert repo.population_sources == ["populate_repo1", "populate_repo2"]
+    assert repo.ubi_population