You have Created "SYS13 Account SKU filter" module to filter out the Volume which is greater than 0 by using Timesum function, so it will filter all combination for all period which having values greater than 0.
It doesn't make sense as well if you have added the weekly Time scale.
It is same as the original module only difference is you have boolean formatted line item instead of number
You can't apply filter if you have time scale because it will be limited to week or year only not dynamic in nature
TIMESUM should be used only when you have a timescale in the source and None in the TARGET Module. You define what all parameters do you need while using TIMESUM
TIMESUM(X) - It will aggregate the values for all periods in the source and bring you one consolidated value into target
TIMESUM(-2,X,2) - It brings value for 5 periods (i.e, 2 in the past, one current and 2 in the future ) from source module and consolidate them into one value into target. Here Current period of the Model plays a vital role
For more information please go through TIMESUM on Anapedia.