it seems I found a small 'discrepancy' with ships .cfg files (data/Sea).
the following 3 ships (I guess imported from SH3): NLTSf, NLTSf2, NOM_Paula have unit type 108 (Small/Medium Freighter), but are being displayed as Tankers in Recognition Manual.
This is easily fixed by making simple changes in .cfg files, but I think in TWOS we must have either correct unit type, or correct RecManualCategory description