diff --git a/addons/purchase_stock/models/stock_move.py b/addons/purchase_stock/models/stock_move.py
index ac406ed23ed..4036598a494 100644
--- a/addons/purchase_stock/models/stock_move.py
+++ b/addons/purchase_stock/models/stock_move.py
@@ -25,7 +25,10 @@ class StockMove(models.Model):
 
     @api.model
     def _prepare_merge_negative_moves_excluded_distinct_fields(self):
-        return super()._prepare_merge_negative_moves_excluded_distinct_fields() + ['created_purchase_line_ids']
+        excluded_fields = super()._prepare_merge_negative_moves_excluded_distinct_fields() + ['created_purchase_line_id']
+        if self.env['ir.config_parameter'].sudo().get_param('purchase_stock.merge_different_procurement'):
+            excluded_fields += ['procure_method']
+        return excluded_fields
 
     def _compute_partner_id(self):
         # dropshipped moves should have their partner_ids directly set