Datagen option is not picking the sequential value in SOAPUI PRO

Hi All,

SOAPUI PRO Am using the datagen for sequence value picking for my executing 

Step :

 Datagen and seleted "list" create the name

below the list am passing sequential value like 

1000

2000

3000

4000

5000

step 2:

adding the API test step and passing the Datagen name in my query parameter 

while executing first it's picking first value

if am executing second and third time it's always picking the first value

Step :

Datagen

Teststep

property tansfer

datasink

please guide me if am wrong anywhere and where, and looking for the valuable solution