This transaction is used in order to to send the payment terms for every price list category are sent to FSM.
Payment terms .
...
| Info |
|---|
Please note that staring from Release 2111, it is possible to filter the payment terms and sent to FSM only relevant entries defined in transaction /PACG/ECM_APTRM - Allowed payment terms |
Payment terms can be defined in SPRO > SD > Master Data > Business Partners > Customers > Billing Document.
As As shown below, the data is updated in FSM "PaymentTerm" DTOPayment Term object . 
...
These data are used in the sales order and quotation in FSM mobile app. 
...