Hello SRM Guru,
We have upgrade SRM system from 4 to 7.0 . We want to create limit carts using the classic method of referencing back end (ECC) contracts.
For this we are trying to extend the contract limit table by adding another item number (CTR_ITEM_NUMBER) but this field is required in structure bbp_pds_limit.
This structure is also included in table /SAPSRM/S_CLL_LIMIT_CONTRACT which already have CTR_ITEM_NUMBER field therefore we can't simply add this field in bbp_pds_limit structure because it wont activate because of two entries of the field in CTR_ITEM_NUMBER (one from itself and another from the include structure bbp_pds_limit).
To over come this error we deleted CTR_ITEM_NUMBER from table /SAPSRM/S_CLL_LIMIT_CONTRACT this way all the structures are ok. But now in the contract limit table the line item is always coming as display only. I have checked everything possible(all the attributes ) for this field in the WD but nothing helps and still it is display only. Have you come across this type of typiecal issue??
conclusion: SAP Table somehow not liking the fields taken from the include instead of the table directly. If it is from the table directly then it appear perfectly in the edit mode but when it is from the include structure it is appearing in display only whatever you do 
Your prompt help will be really appreciated.
Regards
Anup