diff --git a/macros/tables/eff_sat_v0.sql b/macros/tables/eff_sat_v0.sql
index 12d6b0b8..9ebae2fc 100644
--- a/macros/tables/eff_sat_v0.sql
+++ b/macros/tables/eff_sat_v0.sql
@@ -1,4 +1,4 @@
-{%- macro eff_sat_v0(yaml_metadata=none, source_model=none, tracked_hashkey=none,  src_ldts=none, src_rsrc=none, is_active_alias=none, source_is_single_batch=true, disable_hwm=false, additional_columns=none) -%}
+{%- macro eff_sat_v0(yaml_metadata=none, source_model=none, tracked_hashkey=none,  src_ldts=none, src_rsrc=none, is_active_alias=none, source_is_single_batch=none, disable_hwm=false, additional_columns=none) -%}
 
     {% set additional_columns_description = "
     additional_columns::list | string       Additional columns from source system or derived columns which should be part of the eff_sat.
@@ -11,7 +11,17 @@
     {% set src_ldts                 = datavault4dbt.yaml_metadata_parser(name='src_ldts', yaml_metadata=yaml_metadata, parameter=src_ldts, required=False, documentation='Name of the loaddate column in the source model. Optional.') %}
     {% set src_rsrc                 = datavault4dbt.yaml_metadata_parser(name='src_rsrc', yaml_metadata=yaml_metadata, parameter=src_rsrc, required=False, documentation='Name of the record source column in the source model. Optional.') %}
     {% set is_active_alias          = datavault4dbt.yaml_metadata_parser(name='is_active_alias', yaml_metadata=yaml_metadata, parameter=is_active_alias, required=False, documentation='Name of the new active flag column. Optional.') %}
-    {% set source_is_single_batch   = datavault4dbt.yaml_metadata_parser(name='source_is_single_batch', yaml_metadata=yaml_metadata, parameter=source_is_single_batch, required=False, documentation='Whether the source contains only one batch. Optional, default True.') %}
+    {% set source_is_single_batch   = datavault4dbt.yaml_metadata_parser(name='source_is_single_batch', yaml_metadata=yaml_metadata, parameter=source_is_single_batch, required=True, documentation='REQUIRED: Whether the source contains only one batch. Must be defined explicitly (true/false).') %}
+
+    {% if source_is_single_batch is none %}
+        {% do exceptions.raise_compiler_error(
+            "Missing required parameter 'source_is_single_batch' in eff_sat_v0. "
+            ~ "Please define it explicitly as true or false. "
+            ~ "true = source contains only one batch; false = multiple batches. "
+            ~ "Example: source_is_single_batch: true"
+        ) %}
+    {% endif %}
+
     {% set disable_hwm              = datavault4dbt.yaml_metadata_parser(name='disable_hwm', yaml_metadata=yaml_metadata, parameter=disable_hwm, required=False, documentation='Whether the High Water Mark should be disabled or not. Optional.') %}
     {%- set additional_columns      = datavault4dbt.yaml_metadata_parser(name='additional_columns', yaml_metadata=yaml_metadata, parameter=additional_columns, required=False, documentation=additional_columns_description) -%}