The rules in this release apply principally to the IFRS taxonomy and are as follows:

DQC_0101 (Movement of Concepts between Calculation Trees

The rule identifies inappropriate calculation descendants of investing, financing, or operating items in the company’s extension filing for the statement of cash flows by using the calculation linkbase of the IFRS taxonomy. The rule compares the set of elements located in the taxonomy linkbase to the calculation children used in the company’s extension calculation linkbase.

DQC_0102 (Element Values Are Equal (IFRS))

The rule ensures that the values reported between element relationships that are identified as an accounting constant are consistent within the filing (for example, Assets should equal Liabilities plus Equity). The rule checks that the components of the calculation (or the components’ children) are present before checking the calculation.

DQC_0103 (Invalid Value for Percentage Items (IFRS))

This rule identifies instances where filers have used a percentage item type (as defined in the IFRS taxonomy) with a value that is greater than the value of 10.

DQC_0104 (Axis with Inappropriate Members (IFRS))

This rule tests whether certain axes in the IFRS taxonomy that should only contain particular members have only those members. Some axes can have custom or extended (i.e., company specific) members. This rule also tests whether only these axes have custom members and, therefore, limits the use of custom or extended members to those situations where they are appropriate because the member is unique to the filer.

DQC_0105 (FS with No Associated Calculation)

The rule checks if a calculation is defined in any role of the company extension, not just the calculations associated with the roles used to define the presentation linkbase for the Income Statement, the Balance Sheet, the Statement of Cash Flows and the Statement of Comprehensive Income. The rule applies to both the IFRS and US GAAP taxonomies.

DQC_0106 (Assets and Liabilities Classified as Held-For-Sale using Duration Element)

This rule determines where the Assets And Liabilities Classified as Held-For-Sale axis has been used inappropriately by identifying fact values with duration types that have been used with this axis. The rule applies to both the IFRS and US GAAP taxonomies.

XBRL US is also seeking public comment on the DQC’s Guidance on Tagging Axis and Members Using the IFRS Taxonomy. The SEC has suggested filers utilize the predefined table structures included in the US GAAP taxonomy, and it has been assumed that this same guidance applies to the IFRS taxonomy. However, particular axes in the IFRS taxonomy should only have certain members. Failing to adhere to that structure adversely influences data analysis because the resulting axis and member combinations can become nonsensical. The guidance provides limitations on the use of certain axis and member combinations to which filers should adhere when tagging financial information using the IFRS Taxonomy.

The public review period for these proposed rules runs through December 15th, 2020. Rules are considered for approval within 45 days of public review and effective 90 days from approval. To make comments, you must be a member of XBRL US.

Sources:

Public Exposure of Validation Rules & Guidance (xbrl.us)