Customs declaration not creating automatically in GTS for GR of ECC

Hello Experts,

Greetings!

Could you please help me as I am facing an issue in customs management with below scenario (R/3 system to GTS).

Successful case; Delivery has only oneGR(101) material document : Document will be transferred to GTS system(Customs declaration will be created automatically)

Unsuccessful case: Delivery has multiple GR's(Splitting into many) , Document will not be transferred to GTS system, so no customs declaration.

For example:

Successful case; Delivery 1230000123 has GR 123(Quantity 1000) ----> Customs declaration replicated in GTS 10101

Unsuccessful case;  Delivery 1230000123 has (splitting quantity due to batch mgmnt) GR 123(Quantity 500)  |    GR 123(Quantity 250)  |  GR 123(Quantity 250)  | ----> Customs declaration not replicated to GTS

I hope, I explained the issue clearly, Could you please help me out to overcome this issue.

Do we need to maintain additional settings for this?

Thanks!

Regards,

Anand