Creating an existing consumer key/secret in another developer app throws "ConsumerKey already exists"

[adevegowda]

I want to migrate existing consumer key/secret from one developer app to another in the same organization. So I used the following steps:

a) Obtain the existing consumer key/secret (let's say K1/S1) from the "DeveloperApp".

b) Create a new developer app "NewDeveloperApp" with some API Product. This created a new consumer key/secret (let's say K2/S2) for the "NewDeveloperApp".

c) Create consumer key/secret API for the "NewDeveloperApp" with K1/S1 (Step#1 above) using the API documented here -> http://apigee.com/docs/management/apis/post/organizations/%7Borg_name%7D/developers/%7Bdeveloper_ema...

It is also documented in this community post -> https://community.apigee.com/articles/3113/how-to-set-a-custom-api-key-for-a-product.html

d) But I get the error stating K1/S1 already exists as shown below:

{
  "code": "keymanagement.service.ConsumerKeyAlreadyExists",
  "message": "ConsumerKey already exists",
  "contexts": []
}

e) However when I fetch the details of the "NewDeveloperApp", the K1/S1 does not exist.

f) If I try to create consumer key/secret for "NewDeveloperApp" with any random values (using any value other than existing consumer key/secret), then it works fine.

Have I missed anything here ?

Can you please help me to create an existing consumer key/secret taken from one developer app in a different developer app ?