Asset not picked up in AFAB

Hello experts,

When we run tcode AFAB, several assets were not picked up hence depreciation was not posted. Based from the useful life, remaining useful life, depreciation key (straight line) and the current NBV of asset, it should continue to be depreciated. One thing we noticed for those assets that were not picked up was in FY 2016, all the values under Planned Values (AW01N) like NBV are all blank. Also, the expired useful life of asset was reset to zero in FY 2016 although the expired useful life in FY 2015 is 1yr and 08 months (useful life is 10 yrs). The remaining useful in FY2016 should reflect as 8yrs and 4months but instead its 10 years. We just though that this maybe the reason.

Any known reasons why this happen and any possible solution for this?

Thanks!

Jack