[FIX] account_xunnel, invoice_xunnel: Solve issues #828 and error found while working on issue #827 of vauxoo



These changes are adaptations of the changes made on MR!173 and MR!174 from v.14 to v.15, to find more info about these take a look at the MRs added to the RELATED section.

Edited by Yoany Mora Vauxoo

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