Was already presented in a topic of v1.1.2 and has an opened ticket: #2503 but have added information

Have 2 plans:

free plan
paid plan (child of the free plan)

Steps to duplicate the issue

• User has subscribed the free plan
• User subscribes the paid plan and payment is validated
• The stupid user :-)unsubscribes the paid plan
• Profile tab and sub module propose to Resubscribe and user Resubscribes in Offline payment and confirms that is paying Offline to see and print the payment slip

Issue 1 : But the subscriptions profile tab and subscription module are still displaying the proposal to Resubscribe, instead of displaying that he has a pending payment, like in the standard process.

Issue 2 : In the meantime he will think that he hasn't well subscribe and will resubscribe and resubscribe producing:
- New payments in the basket (backend)
- New invoices in the user profile (frontend)

Now if seeing the message saying that he already has a payment receipt he may also:

Issue 3 : OR he click the link to CANCEL "Payment and Susbscription" but the offline pending payments remains in:
- basket (backend)
- invoices in the user profile (frontend)
+ admin can still pay the basket and the duplicated paid and pending payments stay in:
- basket (backend)
- invoices in the user profile (frontend)

Issue 4 : OR he choose to pay, for instance, by CC but the offline pending payments remains in:
- basket (backend)
- invoices in the user profile (frontend)
+ admin can pay the basket and the duplicated paid and pending payments stay in:
- basket (backend)
- invoices in the user profile (frontend)

Conclusion for Offline payments:

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When user uses the offline process and click to try to pay again (eg. from 'Pay now'in the module):
If he choose once again to pay offline, the system should warn him about a pending payment slip and, instead of creating a new one, the system shows 1st pending slip (in case of a user having lost it)
If he choose an other way to pay, eg. Credit card, the system, on completing the CC payment, should delete the offline pending payment invoices/basket/slip.
If he choose to CANCEL "Payment and Susbscription", the system should delete the offline pending of payment invoices/basket/slip and reset the module.