Calling a taskflow with input parameters in a page template

Question

Hi,
I have a taskFlow with an inputParameter, a page template with an attribute and a fragment using this template.
My fragment is passing #{bindings.MyColumn.inputValue} to the template attribute, where bindings.MyColumn is an attributeValues pointing to an iterator.
My template is calling the taskFlow and pass #{attrs.myColumn} to the input parameter. There is an outputText too, displaying #{attrs.myColumn}.
+fragment -- #{bindings.MyColumn.inputValue} --> template -- #{attrs.myColumn} --> taskFlow+
The problem is that #{attrs.myColumn} is resolved to null when is passed to the taskFlow inputParameter. But in the outputText value, #{attrs.myColumn} is resolved to the good value.
I don't understand what is happening.
If I pass #{data.fragmentPageDef.MyColumn.inputValue} directly from my template to the taskFlow input parameter it works, but no with #{attrs.myColumn}.
How can I do to pass a template attribute to a taskFlow inputParameter?

Answer 1

I think it is more something with ADF lifecycle.
Something like : #{attrs.myColumn} is resolved in a phase and the taskFlow in another. I don't know.
I am trying to understand what is done when. I think the answer is in "Prepare Model" and "Prepare Render" phases, but I am far to understand all this...
Any help is welcomed.