Travel Request Status in ZTRIP

Dear Expert,

I need to know the table which is having the travel request status , in Table PTRV_PERIO , the field ANTRG is having only the current status, i wanted to know the previous status also.

The scenario is , when user create the travel request in ZTRIP, the status will be 1 in field ANTRG and when it gets approved the status became 2, so when somebody is doing some changes on the travel request in ztrip and saving the status again became 1 in the field ANTRG.

So i want to know all the status against trip number , from which table i can find this ?

Please help me on this.

Regards,

Sankar