Meaning behind those unconditional tp command mode

Content Author: PrakashP

Can anyone tell me what's the meaning behind all those unconditional mode U1 or U126 or U148 or anything?
tp import transportrequest <sid> clientxxx U1
tp import transportrequest <sid> clientxxx U126
tp import transportrequest <sid> clientxxx U148

The u stands for unconditional force ( how hard you want to force the request into the system - do you want to overwrite without warnings, or softly try to load the objects).  

0: Called a overtaker; change request can be imported from buffer without deleting it and then uncoditional mode 1 is used to allow another import in the correct location.  

1: If U1 is used with the export then it ignores the correct status of the command file; and if it is used with import then it lets the user import the same change request again.  

2: When used with tp export, it dictates the program to not to expand the selection with TRDIR brackets. If used in tp import phase, it overwrites the originals.  

3: When used with tp import, it overwrites the system-dependant objects.  

5: During the import to the consolidation system it permits the source systems other than the integration system.  

6: When used in import phase, it helps to overwrite objects in unconfirmed repairs.  

8: During import phase it ignores the limitations caused by the table classification.  

9: During import it ignores that the system is locked for this kind of transport.  

u128 is combination of 128 OF THE above points.