Hi Ravi,
The reason you are getting Import Container Missing is because at times, when the STXL cluster is read, it doesn't read it in the right order e.g. for one particular Object you have text more 7902 bytes then that particular record is split in 2 and then SRTF2 comes into play.
So SRTF2 with value 0 will store the first 7902 bytes of data and then SRTF2 with value 1 will store anything after that, however both of them need needs to be read together, but while replication that doesn't happen often.
So what I did was read all STXL first for SRTF2 with value 0 then use the following RFC for reading text '/SAPDS/READ_TEXT' to get the whole text since the FM has logic to get the whole text.
Let me know if you need any more information.
There is also an alternative way doing the replication something SAP advises us to do, I couldn't get it to work due to time constraints and hence chose the RFC FM route. Please find the link below for your reference:
SLT - Setting up Replication of INDX Tables
Regards,
Pablo Ghosh Roy