dynp/luw_id_format is a SAP Parameter attribute which is used to control format of luw id (used for update key) information. This is available within R/3 SAP systems depending on the version and release level.
Below is the standard documentation available and a few details of the attributes values .
dynp/trans_id_format specifies the format of the LUW ID. This is a
Universal Unique Identifier (UUID) and one of its uses within the SAP
kernel is as an update key.
Following values are possible:
1. The LUW ID has the UUID format used elsewhere in the SAP system.
2. The LUW ID is created using parameter
See SAP Parameter Documentation for full SAP documentation for this profile parameter.