diff --git a/src/openapi/core/layerMetadata.yaml b/src/openapi/core/layerMetadata.yaml
index c6da81e..e11293b 100644
--- a/src/openapi/core/layerMetadata.yaml
+++ b/src/openapi/core/layerMetadata.yaml
@@ -81,6 +81,7 @@ components:
     ProductName:
       type: string
       description: Layer's external name
+      minLength: 1
     ProductVersion:
       type: string
       pattern: ^[1-9]\d*(\.(0|[1-9]\d?))?$
@@ -115,6 +116,7 @@ components:
       type: array
       items:
         type: string
+        minLength: 1
       minItems: 1
       description: List of layer's regions
     Sensors: