Having problem while creating Search Parameter

[Deleted user]

Hi, I trying to create new SearchParameter but I having an issue.

I couldn't understand why it Could not resolve element for expression ["patient"] ?

My request

PUT /SearchParameter/TrainingSchedules.patient
content-type: text/yaml
accept: text/yaml

name: patient
type: token
resource: {id: TrainingSchedules, resourceType: Entity}
expression: [[patient]] ```

> The response
```yaml 
resourceType: OperationOutcome
text:
  status: generated
  div: Invalid resource
issue:
  - severity: fatal
    code: invalid
    expression:
      - SearchParameter.
    diagnostics: Could not resolve element for expression ["patient"]

And my TrainingSchedules structure is

TrainingSchedules.days	string [ ]	A list of available days

TrainingSchedules.id	string

TrainingSchedules.patient*	Reference	Owner of the schedule

The structure of patient attribute

description: Owner of the schedule
path:
  - patient
refers:
  - Patient
type:
  id: Reference
  resourceType: Entity
resourceType: Attribute
module: fhir-4.0.1
id: TrainingSchedules.patient
resource:
  id: TrainingSchedules
  resourceType: Entity
order: 12
isRequired: true
_source: code
isSummary: true

[spicyfalafel]

Hello, @nyeroglu-actimi. _source: code is intended for Attributes generated by Aidbox. Please remove this field.

[Deleted user]

Thanks @spicyfalafel. The main problem with search parameter is lowercase - uppercase.
Expression in my search parameter was like
expression:

• • Patient

now :
expression:

• • patient
  • id
    Major issue was that.

And second issue was:
We trying to search by id but in query its turned to default code without - id expression.

SELECT "trainingschedules".* FROM "trainingschedules" WHERE
   "trainingschedules".resource @> ? LIMIT ? OFFSET ? 
 - '{"patient":{"code":"b2679cbc-fd85-4292-87e9-ab81273b3b66"}}'