diff --git a/src/operate/lib/OperateApiClient.ts b/src/operate/lib/OperateApiClient.ts
index 6329a87e..4833636c 100644
--- a/src/operate/lib/OperateApiClient.ts
+++ b/src/operate/lib/OperateApiClient.ts
@@ -231,11 +231,13 @@ export class OperateApiClient {
 		const json = this.addTenantIdToFilter(query)
 		const rest = await this.rest
 
-		return rest('decision-definitions/search', {
-			headers,
-			parseJson: (text) => parseSearchResults(text, DecisionDefinition),
-			json,
-		}).json()
+		return rest
+			.post('decision-definitions/search', {
+				headers,
+				parseJson: (text) => parseSearchResults(text, DecisionDefinition),
+				json,
+			})
+			.json()
 	}
 
 	/**
@@ -263,11 +265,13 @@ export class OperateApiClient {
 		const json = this.addTenantIdToFilter(query)
 		const rest = await this.rest
 
-		return rest('decision-instances/search', {
-			headers,
-			parseJson: (text) => parseSearchResults(text, DecisionInstance),
-			json,
-		}).json()
+		return rest
+			.post('decision-instances/search', {
+				headers,
+				parseJson: (text) => parseSearchResults(text, DecisionInstance),
+				json,
+			})
+			.json()
 	}
 
 	/**
diff --git a/src/operate/lib/OperateDto.ts b/src/operate/lib/OperateDto.ts
index fe16649f..7b3b5a26 100644
--- a/src/operate/lib/OperateDto.ts
+++ b/src/operate/lib/OperateDto.ts
@@ -40,6 +40,8 @@ export class DecisionInstance extends LosslessDto {
 	evaluationFailure!: string
 	@Int64String
 	processDefinitionKey!: string
+	@Int64String
+	processInstanceKey!: string
 	decisionId!: string
 	decisionDefinitionId!: string
 	decisionName!: string