Delta replication of contact data - ECC to CRM

Hi,

Customer contacts in CRM did not download correctly from ECC and now I am trying to make a request download of a range of contacts. It's not successful with object BUPA_MAIN.

But if I make a change in ECC, the contact data moves smoothly to CRM with BDOC type BUPA_MAIN and QUEUE R3AD_CUSTOME0000000884

Please help.