Problem creating "Global-OptionSet" attribute using CRM Dynamics WebApi - dynamics-crm

Question

I'm trying to create a "Global OptionSet"-attribute (sd_MyAttribute) for an existing entity (entity ID = 70816501-edb9-4740-a16c-6a5efbc05d84) via Dynamics CRM WebAPI.
The JSON I send is this using method "POST":
{
"#odata.type": "Microsoft.Dynamics.CRM.PicklistAttributeMetadata",
"OptionSet": {
"#odata.type": "Microsoft.Dynamics.CRM.OptionSetMetadata",
"IsGlobal": true,
"Name": "sd_MyPickList",
"OptionSetType": "Picklist",
"MetadataId": "a50cfc0a-e206-ea11-a811-000d3ab82e70"
},
"AttributeType": "Picklist",
"SchemaName": "sd_MyAttribute",
"Description": {
"#odata.type": "Microsoft.Dynamics.CRM.Label",
"LocalizedLabels": [
{
"#odata.type": "Microsoft.Dynamics.CRM.LocalizedLabel",
"Label": "This is the attribute I want to create.",
"LanguageCode": 1033
}
]
},
"DisplayName": {
"#odata.type": "Microsoft.Dynamics.CRM.Label",
"LocalizedLabels": [
{
"#odata.type": "Microsoft.Dynamics.CRM.LocalizedLabel",
"Label": "This is the attribute I want to create.",
"LanguageCode": 1033
}
]
},
"RequiredLevel": {
"Value": "None",
"CanBeChanged": true
}
}
I expected to get a status 204 response, indicating that a new Picklist attribute on the entity using the sd_MyPickList option set has been created.
Unfortunately, the response is:
{
"error": {
"code": "0x80048403",
"message": "Only Local option set can be created through the attribute create. IsGlobal flag must be set to 'false'.",
"innererror": {
"message": "Only Local option set can be created through the attribute create. IsGlobal flag must be set to 'false'.",
"type": "Microsoft.Crm.CrmException",
"stacktrace": " ...)"
}
}
}
There is already an issue in the github project (see https://github.com/MicrosoftDocs/dynamics-365-customer-engagement/issues/601), but I wonder whether there is a way around this problem - what json do I need to send to create an attribute adressing a global option set? Is there someone who has successfully created such an entity attribute via web-api?
There is a usecase, I don't have the ability to use an existing library for that and importing a solution is not an option in my case.
Would be perfect if someone can provide a simple json that can be send e.g. using the Contact entity and any global optionset.

Answer 1

Finally, I found a way to accomplish what I need. To specify the global option set I need to use the "#odata.bind" action in the JSON data. For an attribute "sd_MyAttribute" that uses the global OptionSet with the MetaDataId "62654906-7A0b-ea11-a817-000d3ab826fd", I need to do POST:
{
"#odata.type": "Microsoft.Dynamics.CRM.PicklistAttributeMetadata",
"GlobalOptionSet#odata.bind": "/GlobalOptionSetDefinitions(62654906-7A0b-ea11-a817-000d3ab826fd)",
"AttributeType": "Picklist",
"SchemaName": "sd_MyAttribute",
"Description": { ... },
"DisplayName": { ... },
"RequiredLevel": { ... }
}
If the entity does have the MetaDataId "70916b01-edb2-4840-a16b-6a2efbc75d84", the URI for the POST would be "/api/data/v9.0/EntityDefinitions(70916b01-edb2-4840-a16b-6a2efbc75d84)/Attributes" (logical- or schema-names are not supported).
Hope my question and answer does help someone who gets the same error message.