HMRC servers reject CT600 submission with data validation Error 3317 when submitting iXBRL Computations attachment for accounting period on or after 1st April 2017. One of the recognised UK Taxonomies (UK GAAP or UK IFRS) appears to have an error in the Taxonomy reference.
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HMRC have replaced Government Gateway online service with Digital Transaction Engine for all returns classes.
Since 14 February 2018 when HMRC switched off submissions to Government Gateway, customers using older versions are getting Gateway Authentication Failure messages. Details and solutions are provided...
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