Could someone please answer this simple question about the...

Could someone please answer this simple question about the industry in which CTD and WEB operate. 

Can CTD and WEB both realistically achieve 100% cash conversion (or thereabouts) by year end, when the half year results suggest otherwise?

Consider the following about each.
CTD
For FY18, OCF was $94.4m, compared with $69.3m for FY17. Good result if CTD was not deferring cash payments to suppliers at 30/6/18.
As the AFR's "Rear window" points out this morning, cash flow for 1H19 fell to $14.1m from $25.7m (for 1H18), yet management said "the timing of the cycle will completely reverse at 30 June 2019 and the group expects circa 100% operating cash conversion for the full year". VGI thinks CTD has a problem and now Rear Window is using the latest result to point the finger of suspicion.
WEB
For FY18, OCF was $120.8m, compared with $34.8m for FY17. Cash flow boosted by JacTravel?
For 1H19, OCR was NEGATIVE $26.2m, compared to NEGATIVE $14.5m for 1H18.
So WEB achieved 100% cash conversion for FY18, but can they do it again in FY19?. 
 
Just asking.