Use slicer's value in a matrix visual

I have two tables 'Append1' and 'Append_Pivot2'

The two tables have a "Many to many" cardinality on column [swimmer] with cross filter direction set to both.

I create a matrix visual where :

• matrix Rows are based on the 'Append_Pivot2'[swimmer] column
• matrix Columns are based on 'Append_Pivot2'[columns] and
• matrix Values based on 'Append_Pivot2'[Time for matrix] column.

I have SlicerA that filters the column  'Append1'[swimmer]

The slicer does not affect the matrix, interactions are set to 'none'.

The matrix is filtered by two other slicers:

SliderB filtering 'Append_Pivot2'[columns] and

SlicerC filtering 'Append_Pivot2'[Sort_on_header].

I want to create the measure "Selected Swimmer" that will be used inside the matrix and returns value 1 if the ''Append_Pivot2"[swimmer] used in the matrix rows equals the 'Append1'[swimmer] selected in the SlicerA.

I wrote the following:

Selected Swimmer = 
 
IF(
    SELECTEDVALUE('Append1'[Swimmer]) = 
    SELECTEDVALUE('Append_Pivot2'[Swimmer]), 1, 0
)

However its not working as expected, because all rows are returning value "1".

I Cannot figure out what I am missing.
Your help would be highly appreciated

many thanks 

K