anchor.diff:  |===
   |Catalog Name   |effectiveDate | Plan Details
   //-------------
  -|modify-plan-price-with-effective-date-existing-sub-v1.xml  |2020-01-01T00:00:00+00:00 | `standard-monthly` plan with `$30` recurring charge
  -|modify-plan-price-with-effective-date-existing-sub-v2.xml  |2021-01-15T00:00:00+00:00 | `standard-monthly` plan with `$60` recurring charge. The `standard-monthly` plan has `effectiveDateForExistingSubscriptions=2021-03-01T00:00:00+00:00`
  +|https://github.com/killbill/killbill-docs/blob/5a61ac1957f9174fd4e291c7b61a17c186194388/catalogs/modify-plan-price-with-effective-date-for-existing-subscriptions/modify-plan-price-with-effective-date-existing-sub-v1.xml[modify-plan-price-with-effective-date-existing-sub-v1.xml]  |2020-01-01T00:00:00+00:00 | `standard-monthly` plan with `$30` recurring charge
  +|https://github.com/killbill/killbill-docs/blob/5a61ac1957f9174fd4e291c7b61a17c186194388/catalogs/modify-plan-price-with-effective-date-for-existing-subscriptions/modify-plan-price-with-effective-date-existing-sub-v2.xml[modify-plan-price-with-effective-date-existing-sub-v2.xml]  |2021-01-15T00:00:00+00:00 | `standard-monthly` plan with `$60` recurring charge. The `standard-monthly` plan has `effectiveDateForExistingSubscriptions=2021-03-01T00:00:00+00:00`
   |===
   
   The following table lists the actions and their results:
  
positive.code: |===
  |Catalog Name   |effectiveDate | Plan Details
  //-------------
  |add-new-plan-v1.xml  |2020-01-01T00:00:00+00:00 | `standard-monthly` plan with `$30` recurring charge
  |add-new-plan-v2.xml  |2020-01-15T00:00:00+00:00 | `standard-monthly` plan with `$30` recurring charge, `standard-yearly` plan with `$540` recurring charge.
  |===
  
  The following table lists the actions and their results:
  
negative.code: |===
  |Catalog Name   |effectiveDate | Plan Details
  //-------------
  |https://github.com/killbill/killbill-docs/blob/5a61ac1957f9174fd4e291c7b61a17c186194388/catalogs/modify-plan-price-without-effective-date-for-existing-subscriptions/modify-plan-price-without-effective-date-for-existing-sub-v1.xml[modify-plan-price-without-effective-date-for-existing-sub-v1.xml]  |2020-01-01T00:00:00+00:00 | `standard-monthly` plan with `$30` recurring charge
  |https://github.com/killbill/killbill-docs/blob/5a61ac1957f9174fd4e291c7b61a17c186194388/catalogs/modify-plan-price-without-effective-date-for-existing-subscriptions/modify-plan-price-without-effective-date-for-existing-sub-v2.xml[modify-plan-price-without-effective-date-for-existing-sub-v2.xml]  |2020-01-15T00:00:00+00:00 | `standard-monthly` plan with `$60` recurring charge
  |===
  
  The following table lists the actions and their results:
  