Hi,
Have you tried to run data source at RSA3 source side?
Before appending a structure, is your delta load went fine?
After the init, how much time gap you gave to run delta info pack?
After the replication, have you activated data source properly?
Can you replicate data source into bw and activate it.
From PSA, you can make your failed request technical status red and trigger delta info pack.
it may ask for repeat delta, yes and continue.
Thanks