Formula for required parameter is never calculated by Arelle

[Pavel Malafeev]

I'm trying to open attached instance in Arelle and getting error

[xbrlve:missingParameterValue] Parameter par:refPeriodEnd is required but not input - http://www.cbr.ru/xbrl/ext/params-rend.xml 7

Taxonomy can be found here: http://cbr.ru/Content/Document/File/33022/final_1_0.zip

It seems that the problem is caused by the function validate in module ValidateFormula.py. In first place this function checks "required" flag and immediately logs error if a value is not provided. Formula calculation is executed only after this check and thus only for optional parameters. So, formula for required parameter is never calculated and parameter is always empty.

I tried to bypass this error by providing value for the parameter using Tools>Formula>Parameters. 

I added parameter with QName = {http://parameters}refPeriodEnd, Type = date and Value = 2017-10-31.

I tried to open instance again and got exception in console:

Exception in thread Thread-3:

Traceback (most recent call last):

  File "C:\Python35\lib\threading.py", line 914, in _bootstrap_inner

    self.run()

  File "C:\Python35\lib\threading.py", line 862, in run

    self._target(*self._args, **self._kwargs)

  File "C:\projects\Arelle\arelle\CntlrWinMain.py", line 807, in backgroundLoadXbrl

    RenderingEvaluator.init(modelXbrl)

  File "C:\projects\Arelle\arelle\RenderingEvaluator.py", line 54, in init

    ValidateFormula.validate(modelXbrl, xpathContext=modelXbrl.rendrCntx, parametersOnly=True, statusMsg=_("compiling rendering tables"))

  File "C:\projects\Arelle\arelle\ValidateFormula.py", line 393, in validate

    typeLocalName = paramDataType.localName if paramDataType else "string"

AttributeError: 'str' object has no attribute 'localName'

There is another exception in table rendering phase for this instance and taxonomy:

[arelle:resolutionException] Exception in resolution of definition node table:aspectNode: list index out of range - http://www.cbr.ru/xbrl/nso/purcb/rep/2017-12-31/tab/SR_0420417/SR_0420417-rend.xml 396

Traceback (most recent call last):

  File "C:\projects\Arelle\arelle\RenderingResolver.py", line 459, in expandDefinition

    checkLabelWidth(childStructuralNode, checkBoundFact=True)

  File "C:\projects\Arelle\arelle\RenderingResolver.py", line 241, in checkLabelWidth

    if widestWordLen > view.rowNonAbstractHdrSpanMin[structuralNode.depth]:

IndexError: list index out of range

During handling of the above exception, another exception occurred:

Traceback (most recent call last):

  File "C:\projects\Arelle\arelle\RenderingResolver.py", line 68, in resolveAxesStructure

    return resolveTableAxesStructure(view, table, tblAxisRelSet)

  File "C:\projects\Arelle\arelle\RenderingResolver.py", line 133, in resolveTableAxesStructure

    expandDefinition(view, yTopStructuralNode, definitionNode, definitionNode, 1, disposition, facts, i, tblAxisRels)

  File "C:\projects\Arelle\arelle\RenderingResolver.py", line 538, in expandDefinition

    raise ex.with_traceback(ex.__traceback__)  # provide original traceback information

  File "C:\projects\Arelle\arelle\RenderingResolver.py", line 341, in expandDefinition

    expandDefinition(view, childStructuralNode, breakdownNode, childDefinitionNode, depth+ordDepth, axisDisposition, facts, i, tblAxisRels) #recurse

  File "C:\projects\Arelle\arelle\RenderingResolver.py", line 547, in expandDefinition

    raise e.with_traceback(ex.__traceback__)  # provide original traceback information

  File "C:\projects\Arelle\arelle\RenderingResolver.py", line 459, in expandDefinition

    checkLabelWidth(childStructuralNode, checkBoundFact=True)

  File "C:\projects\Arelle\arelle\RenderingResolver.py", line 241, in checkLabelWidth

    if widestWordLen > view.rowNonAbstractHdrSpanMin[structuralNode.depth]:

arelle.RenderingResolver.ResolutionException: [arelle:resolutionException] exception Exception in resolution of definition node table:aspectNode: list index out of range