91 15. Provisions  The Group issues various types of contractual product warranties under which it guarantees the performance of products delivered for a certain period  or term. The estimated provision is based on historical warranty data. The provision for dilapidation includes costs of dismantling and restoring the  offices of the Group to their original condition at end the end of the lease terms. The changes in the provision are summarised as follows:  Other current liabilities comprise: 16. Other current liabilities  17. Other non-current financial liabilities  Terms and conditions of the above other current liabilities:  Other non-current financial comprise:   obligations for personnel and social expenses have an average term of three months (2011: three months); and   other payables are non-interest bearing and are normally settled on 30 day terms.  At 1 January   2012  US$000 Currency change US$000 Discount 000US$ Additions US$000 Used  US$000  Released US$000 At 31 December  2012 US$000 Obligations for product warranties  573  – – 788 (430) (119) 812 Pending legal claims  301  6 – – –  – 307 Other  166  1 – 112 (110) – 169 Total current  1,040  7 – 900 (540) (119) 1,288 Dilapidation  536  22 39 6 –  – 603 Total non-current  536  22 39 6 –  – 603 Total  1,576  29 39 906 (540) (119) 1,891 At 31 December 2012 US$000 At 31 December 2011 US$000 Obligations for personnel and social expenses  15,348 12,206 Advances received in relation to customer specific research and development contracts  2,100 721 Other 4,222 3,625 21,670 16,552 At 31 December 2012 US$000 At 31 December 2011 US$000 Liabilities relating to the convertible bond $^{1)}$  164,589 – Liabilities relating to hire purchase and finance lease obligations  12,028 373 176,617 373 [1] Please refer to note 18 Convertible Bond 