Count Distinct Values Over Time & slice

Hi v-yulgu-msft thanks for helping,

Appologies if it wasnt clear - I had commented out the dax in the measure (in the code example) for the one that returns the right result but is not sliceable. Here it is, uncommented so you can see what i am trying to do:

m_CountDistinctIMO_OverTime = CALCULATE(
				[m_Count_IMONumber],
				
				//ERROR - using ALL() on the main fact table means slicers dont work on it.
			        //notes: vessels in transit durin CURRENT month and dispatched
				//notes: load <=end of current month AND dispatch >=start of current month				
			        FILTER(	
					all(Shipments),
					Shipments[LoadDate] < max(DateTable[lastDayOfMonth])+1 &&
					Shipments[DischargeDate] >= min(DateTable[firstDayOfMonth])
				)
)

I have amended the measure in the demo file too so you can see it not slicing. I have just tried using Allselected() as you suggested and although it makes the visuals slica-able again, the incorrect result is returned. As a guide - the correct result for June 2017 is 2691.

Here's the new version fo the demo file: https://drive.google.com/file/d/1bPUXMFMsNBRUhXmyU6pNvWzv1oMH7u6p/view?usp=sharing

If there is anything else i can do to better illustrae the problem to enable you to assist then please just say and ill do all i can.

many thanks again for your help

Mat