Importing Configurable Products Error

The "Options" field value for the C item is (AB Tech) Size: S|-04,-05

The "Variation options" field value for the first V item is Size:-04

The import error message I get is: Couldn't import product (product code): option "Size" doesn't have variant "-04".

(also same error for next V item which is size -05)

I do have the Product variations add-on installed

Syntax appears correct according to documentation??

Any help much appreciated.