TREX data not updating

Hi Experts,

There is an order which has 1 header and 3 items in CRM system. And the order was sync to TREX.

One item (item 40) data is stale.

I tried to update the order with FM 'CRM_EI_KB_SET_DELTA_UPDATE_UT' and report CRM_SAF_COMPILATION_DELTA. The header, item 10 and item 30 were updated. But item 40 was not updated still.

In table CRMD_EI_LANG_SAP, I can find all 4 KB ID before executing report CRM_SAF_COMPILATION_DELTA.

How can I find the reason of data not updating?

Thanks.