We are unable to blcok / un-block the transportation lane by using Tcode "MASSD". Error message being displayed is
Validity periods for means of transport 0001 in 1380 -> 3900 overlap Message no. /SAPAPO/OO_TR256.
Though, we are able to block / un-block single item at a time (by opening the tlane - /sapapo/SCC_TL1) i.e. Master data and T.Lane Maintenance.
We are supposed to unblock T.Lane for more than 6000 items, which is not possible without MASSD. So, please advise further.
Thanks & Best Regards,