Empty instantiationLevelId Causes Bad Request in SOL002 VNFLCM instantiateVnfRequest json
**Error Details:**
The The API returns a 400 Bad Request with the following message:
“Invalid input for field instantiationLevelId. Value: '' should be non-empty”
**Reason:**
The request template “instantiateVnfRequest.json” includes “instantiationLevelId” with an empty value (""), whereas the API strictly requires this field to contain a valid, non-empty value if provided.
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