Hi All,
It seems to be a standard error , so as a work around i have just called this to read the discription in the Getter of DELCO_T.
CHECK current IS BOUND.
lt_results_tab = cl_crm_uiu_erp_order_vh=>get_values_for_delco( ).
lv_delco = current->get_property_as_string( 'DELCO' ).
READ TABLE lt_results_tab
INTO ls_results_tab
WITH KEY key = lv_delco.
CHECK sy-subrc IS INITIAL.
value = ls_results_tab-value.
Solved so Closing