diff --git a/shopdb/core/api/reports.py b/shopdb/core/api/reports.py
index c31d93f..238878e 100644
--- a/shopdb/core/api/reports.py
+++ b/shopdb/core/api/reports.py
@@ -467,9 +467,14 @@ def pc_relationships():
     Query parameters:
     - format: 'json' (default) or 'csv'
     """
-    # Asset relationships where a computer (source) relates to a machine
-    # (target) - the asset-model equivalent of the legacy PC->machine links.
-    sql = db.text("""
+    # PC <-> machine relationships in EITHER direction. The import orients edges
+    # both ways: the general machinerelationships migration stores machine(source)
+    # -> PC(target), while the synthetic measuring-tool links store PC(source) ->
+    # tool(target). Match both so the report is not empty just because of edge
+    # direction (this is a conceptually undirected "PC runs machine" report).
+    # Each half joins a computer on one end and a machine on the other; the
+    # machine end supplies machine_number/vendor/model, the PC end hostname/ip.
+    half = """
         SELECT
             eq.assetnumber AS machine_number,
             v.vendor AS vendor,
@@ -477,17 +482,22 @@ def pc_relationships():
             COALESCE(cpc.hostname, pc.assetnumber) AS hostname,
             c.ipaddress AS ip
         FROM assetrelationships ar
-        JOIN assets pc ON ar.sourceassetid = pc.assetid
-        JOIN computers cpc ON cpc.assetid = pc.assetid
-        JOIN assets eq ON ar.targetassetid = eq.assetid
-        JOIN machines eqx ON eqx.assetid = eq.assetid
-        LEFT JOIN communications c ON c.assetid = pc.assetid AND c.isprimary = 1 AND c.comtypeid = 1
+        JOIN computers cpc ON cpc.assetid = ar.{pc_end}
+        JOIN assets pc ON pc.assetid = ar.{pc_end}
+        JOIN machines eqx ON eqx.assetid = ar.{machine_end}
+        JOIN assets eq ON eq.assetid = ar.{machine_end}
+        LEFT JOIN communications c ON c.assetid = pc.assetid AND c.isprimary = 1
         LEFT JOIN models mo ON eqx.modelnumberid = mo.modelnumberid
         LEFT JOIN vendors v ON mo.vendorid = v.vendorid
         WHERE ar.isactive = 1
         AND eq.assetnumber IS NOT NULL AND eq.assetnumber != ''
-        ORDER BY eq.assetnumber
-    """)
+    """
+    sql = db.text(
+        half.format(pc_end='sourceassetid', machine_end='targetassetid')
+        + ' UNION '
+        + half.format(pc_end='targetassetid', machine_end='sourceassetid')
+        + ' ORDER BY machine_number'
+    )
 
     results = db.session.execute(sql).fetchall()
     data = [{
diff --git a/tests/test_core/test_pc_relationships.py b/tests/test_core/test_pc_relationships.py
new file mode 100644
index 0000000..cbd7e57
--- /dev/null
+++ b/tests/test_core/test_pc_relationships.py
@@ -0,0 +1,50 @@
+"""Regression: /api/reports/pc-relationships must return PC<->machine links
+regardless of edge direction.
+
+The import stores the general machinerelationships as machine(source) ->
+PC(target); an earlier query only matched PC(source) -> machine(target), so on
+prod (331 relationships) the report came back empty. The query is now
+direction-agnostic.
+"""
+
+
+def _asset(db, assettype_name, plugin, table, assetnumber):
+    from shopdb.core.models import AssetType, Asset
+    at = AssetType.query.filter_by(assettype=assettype_name).first()
+    if not at:
+        at = AssetType(assettype=assettype_name, pluginname=plugin, tablename=table)
+        db.session.add(at)
+        db.session.flush()
+    asset = Asset(assettypeid=at.assettypeid, assetnumber=assetnumber)
+    db.session.add(asset)
+    db.session.flush()
+    return asset
+
+
+def test_pc_relationships_matches_machine_to_pc_direction(client, db, auth_headers):
+    from shopdb.core.models import AssetRelationship, RelationshipType
+    from plugins.computers.models import Computer
+    from plugins.machines.models import Machine
+
+    pc_asset = _asset(db, 'computer', 'computers', 'computers', 'TESTPC01')
+    eq_asset = _asset(db, 'machine', 'machines', 'machines', '4242')
+    db.session.add(Computer(assetid=pc_asset.assetid, hostname='testpc01'))
+    db.session.add(Machine(assetid=eq_asset.assetid))
+
+    rt = RelationshipType.query.filter_by(relationshiptype='controls').first()
+    if not rt:
+        rt = RelationshipType(relationshiptype='controls')
+        db.session.add(rt)
+        db.session.flush()
+
+    # REVERSE of the old-only direction: machine is the source, PC the target.
+    db.session.add(AssetRelationship(
+        sourceassetid=eq_asset.assetid, targetassetid=pc_asset.assetid,
+        relationshiptypeid=rt.relationshiptypeid, isactive=True))
+    db.session.commit()
+
+    resp = client.get('/api/reports/pc-relationships', headers=auth_headers)
+    assert resp.status_code == 200
+    rows = resp.get_json()['data']['data']
+    assert any(r['machine_number'] == '4242' and r['hostname'] == 'testpc01'
+               for r in rows), rows