Unable to update pricing for plan in sandbox account (PRICING_SCHEME_UPDATE_NOT_ALLOWED)

[ShubhamMishra]

Unable to update pricing for plan in sandbox account (PRICING_SCHEME_UPDATE_NOT_ALLOWED)
Request:-
https://api-m.sandbox.paypal.com/v1/billing/plans/P-5TD04514DU568400GMDCGH2I/update-pricing-schemes

{

"pricing_schemes": [{

"billing_cycle_sequence": 2,

"pricing_scheme": {

"fixed_price": {

"value": "50",

"currency_code": "USD"

}

}

}

]

}

Response:-

{

"name": "UNPROCESSABLE_ENTITY",

"message": "The requested action could not be performed, semantically incorrect, or failed business validation.",

"debug_id": "1f4c7375963cb",

"details": [

{

"issue": "PRICING_SCHEME_UPDATE_NOT_ALLOWED",

"description": "Pricing scheme update is not allowed for the plan."

}

],

"links": [

{

"href": "#",

"rel": "information_link",

"method": "GET"

}

]

}