arcgis desktop - Nesting two iterators for cost distance calculation in ModelBuilder?

I am attempting to calculate cost distances iteratively for each point element in different datasets.

I created a model that does the job for a single dataset but when I try to batch it I'm getting the following error "ERROR 000865: Input raster or feature source data: I_atlanta_OBJECTID does not exist".

This is, the output layer generated in the "feature select" submodel is not a valid input in the cost distance or in any other process I put after the iterator.

This error occurs only when I nested the model to run it in different datasets and not when I run the model in only one dataset.

Is there any consideration I have to take into account when nesting models?

I have read the documentation available with no luck so far.