Hi,

I am trying to update the target roas with the API. However I get the 
following error message: 


GoogleAdsException: (<_InactiveRpcError of RPC that terminated with: status 
= StatusCode.INVALID_ARGUMENT details = "Request contains an invalid 
argument." debug_error_string = "UNKNOWN:Error received from peer 
ipv4:74.125.193.95:443 {grpc_message:"Request contains an invalid 
argument.", grpc_status:3, 
created_time:"2024-01-04T14:51:29.347713307+00:00"}" >, <_InactiveRpcError 
of RPC that terminated with: status = StatusCode.INVALID_ARGUMENT details = 
"Request contains an invalid argument." debug_error_string = "UNKNOWN:Error 
received from peer ipv4:74.125.193.95:443 {grpc_message:"Request contains 
an invalid argument.", grpc_status:3, 
created_time:"2024-01-04T14:51:29.347713307+00:00"}" >, errors { error_code 
{ context_error: OPERATION_NOT_PERMITTED_FOR_CONTEXT } message: "The 
operation is not allowed for the given context." trigger { string_value: 
"EXPRESS(EXPRESS_SMART)" } location { field_path_elements { field_name: 
"operations" index: 0 } field_path_elements { field_name: "update" } 
field_path_elements { field_name: "maximize_conversion_value" } 
field_path_elements { field_name: "target_roas" } } } request_id: 
"fZX_kkC8f6ABE5BOoQspwQ" , 'fZX_kkC8f6ABE5BOoQspwQ')

Code first try:
customer_id = str(customer_id)
# Create the appropriate service and operation based on entity_type
service = client.get_service("CampaignService")
operation = client.get_type("CampaignOperation")
update = operation.update
update.resource_name = service.campaign_path(
customer_id, campaign_id
)
update.maximize_conversion_value.target_roas = target_roas 
client.copy_from(
operation.update_mask,
protobuf_helpers.field_mask(None, update._pb),
)

response = service.mutate_campaigns(customer_id=customer_id, 
operations=[operation]) 
code second try (changing the update field): 
# Cast to string
customer_id = str(customer_id)
# Create the appropriate service and operation based on entity_type
service = client.get_service("CampaignService")
operation = client.get_type("CampaignOperation")
update = operation.update
update.resource_name = service.campaign_path(
customer_id, campaign_id
)
update.target_roas.target_roas = target_roas 
client.copy_from(
operation.update_mask,
protobuf_helpers.field_mask(None, update._pb),
)

response = service.mutate_campaigns(customer_id=customer_id, operations=
[operation])
print('Updated campaign %s.' % response.results[0].resource_name)
I am following the references in the google ads API and they suggest to use 
these code. Thanks for the help! Kind regards,
Siebert

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