Import declaration prior to GR

Hello experts,

Need your help for the no data in the worklist for create import declaration prior to GR.

ECC plug in is done.

GTS 11.0 setting:

1. The document type IMPORD  and DTAVI are activated for customs processing.  /SAPSLL/TLECHS include IMPORD and DTAVI for LECCUS。
2. In the control setting of process, the checkbox of “worklist: CD prior to GR” are activated.

when I created PO in ECC, compliance document are created in GTS without legal block. The table /SAPSLL/CUHD the field CDCUS are marked "X".

But now neither PO nor IBD could be found in the worklists for creating a customs document prior to GR.

appreciate your time for help.